The fm:IfFacebookLiked component can be used to determine whether the user has pressed the Facebook "like" button for a Facebook Iframe applciation..
This would typically be used on a Facebook application's tab page to show content to only your fans.
<fm:IfFacebookLiked>
<h2>You liked this application so you get exclusive access to this content!</h2>
<fm:MediaList fileTypes="1">
<fm:Loop>
<ul>
<img src="{$$media_publicUrl}/15" /></li>
</ul>
</fm:Loop>
<fm:NoResults>
No media is available yet
</fm:NoResults>
</fm:MediaList>
<fm:Else>
<h2>You have not liked this application yet. Press "like" to get access to exclusive content!</h2>
</fm:Else>
</fm:IfFacebookLiked>
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