<p>It is for anonymous users to vote on the quality of a post.</p>

<p>It gathers opinions from people with no account or little rep in a way that doesn't affect the user or the poster's reputation.</p>

<p><strong>Source: <a href="http://meta.stackexchange.com/questions/98630/anonymous-user-feedback-now-in-testing">Anonymous user feedback now in testing</a></strong></p>