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<article>
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<h1>Fediverse ID (Fediverse)</h1>
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<section>
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<address class="h-card">
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by
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<a rel="author" class="u-url" href="http://changelog.ca/"><span class="p-given-name">Charles</span> <span class="p-additional-name">Iliya</span> <span class="p-family-name">Krempeaux</span></a>
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</address>
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</section>
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<section>
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<p>
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The final say for what is and is not a valid <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> are the many implementations of <ziba-link transform="lowercase">WebFinger</ziba-link> in-the-wild in all the different <ziba-link transform="lowercase">Fediverse software</ziba-link> out there.
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(Which could be different from each other.)
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</p>
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<p>
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Because, from a technical point-of-view, a <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> is turned into an <ziba-link>acct URI</ziba-link> and then resolved with <ziba-link transform="lowercase">WebFinger</ziba-link>.
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</p>
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<p>
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Also, there currently is no canonical syntax for a <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link>.
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Currently, the syntax of a <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> is whatever each implementation supports.
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(Which again could be different from each other.)
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</p>
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<p>
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But, having said that, we can infer a <em>minimum syntax</em> for what should be considered a valid<ziba-link transform="lowerllamacase">Fediverse ID</ziba-link>.
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I.e., the syntax that any implmentation for <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link>s <em>should</em> support.
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But, to say it explicitly, an implemention for <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link>s <em>could</em> support more than just what is given by this syntax.
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</p>
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<section>
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<h2>acct URI</h2>
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<p>
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Part of the process of <strong>resolving</strong> a <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> transfomrs a <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> into an <ziba-link>acct URI</ziba-link>.
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(And then using that <ziba-link>acct URI</ziba-link> version of the <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> makes a request to <ziba-link transform="lowercase">WebFinger</ziba-link>.)
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</p>
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<p>
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Here is an example of transforming a <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> into an <ziba-link>acct URI</ziba-link>:
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</p>
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<pre>
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at sign
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↓
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@joeblow@example.com ← Fediverse ID
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acct:joeblow@example.com ← acct URI
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↑
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no at sign
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</pre>
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<p>
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A client would then make a request to:
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</p>
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<pre>
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https://example.com/.well-known/host-meta
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</pre>
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<p>
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To discover what the (template) URL for <ziba-link transform="lowercase">WebFinger</ziba-link> is.
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And then, for example, if it is at:
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</p>
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<pre>
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https://example.com/.well-known/webfinger?resource={uri}
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</pre>
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<p>
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Then make a request to:
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</p>
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<pre>
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https://example.com/.well-known/webfinger?resource=acct:joeblow@example.com
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</pre>
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</section>
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<section>
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<h2>Fediverse ID Syntax</h2>
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<p>
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Inferring from IETF RFC-7565 (The 'acct' URI Scheme) and referenced IEFC RFCs, the syntax of a <ziba-link transform="lowerllamacase">Fediverse ID</ziba-link> is:
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</p>
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<pre>
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fediverseID = "@" actor "@" host
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</pre>
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<p>
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Where “actor” is defined as:
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</p>
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<pre>
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actor = unreserved / sub-delims 0*( unreserved / pct-encoded / sub-delims )
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unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
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sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
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pct-encoded = "%" HEXDIG HEXDIG
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ALPHA = %x41-5A / %x61-7A ; A-Z / a-z
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DIGIT = %x30-39 ; 0-9
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HEXDIG = DIGIT / "A" / "B" / "C" / "D" / "E" / "F"
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</pre>
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<p>
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(Again note that an implementation <em>could</em> support more characters for “actor” than what is given by this definition.)
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</p>
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<p>
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And “host” is defined as
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</p>
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<pre>
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host = IP-literal / IPv4address / reg-name
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IP-literal = "[" ( IPv6address / IPvFuture ) "]"
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IPv6address = 6( h16 ":" ) ls32
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/ "::" 5( h16 ":" ) ls32
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/ [ h16 ] "::" 4( h16 ":" ) ls32
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/ [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32
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/ [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32
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/ [ *3( h16 ":" ) h16 ] "::" h16 ":" ls32
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/ [ *4( h16 ":" ) h16 ] "::" ls32
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/ [ *5( h16 ":" ) h16 ] "::" h16
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/ [ *6( h16 ":" ) h16 ] "::"
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h16 = 1*4HEXDIG
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ls32 = ( h16 ":" h16 ) / IPv4address
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IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
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IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
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dec-octet = DIGIT ; 0-9
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/ %x31-39 DIGIT ; 10-99
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/ "1" 2DIGIT ; 100-199
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/ "2" %x30-34 DIGIT ; 200-249
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/ "25" %x30-35 ; 250-255
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reg-name = *( unreserved / pct-encoded / sub-delims )
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</pre>
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</section>
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</article>
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</section>
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</section>
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<section>
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<section>
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<p>
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<p>
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A <strong>Fediverse ID</strong> is an identifier that conceptually is usually used to point to a <strong>person</strong>, but also can be conceptually used to point to an <strong>application</strong>, a <strong>group</strong>, a <strong>organization</strong>, a <strong>service</strong>, or any other type of entity.
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A <strong>Fediverse ID</strong> is an identifier that conceptually is usually used to point to a <strong>person</strong>, but also can be conceptually used to point to an <strong>application</strong>, a <strong>group</strong>, a <strong>organization</strong>, a <strong>service</strong>, or any types of entities.
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</p>
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</p>
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<p>
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<p>
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Here are some sample <strong>Fediverse ID</strong>s:
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Here are some sample <strong>Fediverse ID</strong>s:
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at sign
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at sign
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↓
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↓
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@joeblow@example.com ← Fediverse ID
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@joeblow@example.com ← Fediverse ID
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joeblow@example.com ← e-mail address
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joeblow@example.com ← e-mail address
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↑
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↑
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no at sign
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no at sign
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</pre>
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</pre>
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</figure>
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</figure>
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</section>
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<section>
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<h2>Usage</h2>
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<p>
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<strong>Fediverse IDs</strong> appear in posts on the <strong>Fediverse</strong>, and are typed (something with the help of some form of autocomplete) by users.
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</p>
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</section>
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<section>
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<h2>acct URI</h2>
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<p>
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Part of the process of <strong>resolving</strong> a <strong>Fediverse ID</strong> transfomrs a <strong>Fediverse ID</strong> into an <ziba-link>acct URI</ziba-link>.
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(And then using that <ziba-link>acct URI</ziba-link> version of the <strong>Fediverse ID</strong> to make a request to <ziba-link transform="lowercase">WebFinger</ziba-link>.)
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</p>
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<p>
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Here is an example:
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</p>
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<pre>
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at sign
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↓
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@joeblow@example.com ← Fediverse ID
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acct:joeblow@example.com ← acct URI
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↑
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no at sign
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</pre>
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</section>
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<section>
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<h2>See Also</h2>
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<ul>
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<ul><ziba-link title="fediverseid syntax">Fediverse ID syntax</ziba-link></ul>
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</ul>
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</section>
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</article>
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<ul>
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<ul>
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<li><ziba-link transform="lowercase">FediDB</ziba-link></li>
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<li><ziba-link transform="lowercase">FediDB</ziba-link></li>
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<li><ziba-link transform="lowerllamacase">Fediverse ID</ziba-link></li>
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<li><ziba-link transform="lowerllamacase">Fediverse ID</ziba-link></li>
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<li><ziba-link title="fediverseid syntax">Fediverse ID syntax</ziba-link></li>
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<li><ziba-link>firefish</ziba-link></li>
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<li><ziba-link>firefish</ziba-link></li>
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<li><ziba-link>forgejo</ziba-link></li>
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<li><ziba-link>forgejo</ziba-link></li>
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<li><ziba-link>friendica</ziba-link></li>
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<li><ziba-link>friendica</ziba-link></li>
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