p><code>Authenticate</code> creates a <code>credential</code> object that enables R to make authenticated calls to
social media APIs. A <code>credential</code> object is a S3 object containing authentication related information such as
an access token or key, and a class name identifying the social media that grants authentication.
<code>Authenticate</code> is the first step of the <code>Authenticate</code>, <code><a href="Collect.html">Collect</a></code> and <code><a href="Create.html">Create</a></code>
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