I'm having trouble reproducing the problem but on one of my coworker's computers and one of our users has reported an issue when liking one of our blog posts.
In a version of IE (i think IE8), when they try to like something and are not already logged into facebook, it prompts them to log in in a large window, but the log in is never successful and sometimes to pop-up doesn't disappear
Here's the error my coworker gets
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0; InfoPath.3)
Timestamp: Thu, 17 May 2012 21:18:03 UTC
Message: 'window.opener.closed' is null or not an object
Here's a sample page
and here's our implementation
<ul addthis:url="http://cfa.is/JKlIQD" class="addthis_toolbox addthis_default_style">
<li><a data-url="http://cfa.is/JKlIQD" data-related="CFAInstitute" data-via="CFAInstitute" data-count="horizontal" class="twitter-share-button" href="https://twitter.com/share">Tweet</a></li>
<li><a layout="button_count" class="addthis_button_facebook_like"></a></li>
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