BuddyPress.org

No need of a plugin, just insert

‘
<iframe src="http://www.facebook.com/plugins/like.php?href=&layout=standard&show_faces=true&width=450&action=like&colorscheme=light&#8221; scrolling=”no” frameborder=”0″ allowTransparency=”true” style=”border:none; overflow:hidden; width:450px; height:60px”>
‘
on the page where you want to add the like button. Then change the permalink to the correct one.
In the moment its the like script for groups.

would not be hard to make a plugin for this if someone have the time.