<p>I don't know anything about osqa or libravatar but the recent <a href="http://blog.stackoverflow.com/2012/12/podcast-39-the-one-with-wil-wheaton/">stackexchange podcas</a>t suggested that there are planned changes relvant to avatars. This has been <a href="http://meta.stackexchange.com/a/161083/147520">confirmed</a> by <a href="http://stackexchange.com/users/1635441/jeremy-tunnell">Jeremy Tunnell</a>. It looks like SE plans to host user avatars themselves as well as continuing to support gravatars.</p>