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      <h1>The Open Graph protocol</h1>
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<h2 id="aidintrohrefintrointroductiona"><a id="intro" href="#intro">Introduction</a></h2>
<p>The <a href="https://ogp.me/">Open Graph protocol</a> enables any web page to become a
rich object in a social graph. For instance, this is used on Facebook to allow
any web page to have the same functionality as any other object on Facebook.</p>
...