BuddyPress.org

Here’s the group one to use: bp_group_permalink()

Here’s the code I used to add a facebook like button to the group header:

<iframe src="http://www.facebook.com/plugins/like.php?href=&layout=standard&show-faces=true&width=450&action=like&font=arial&colorscheme=light&#8221; scrolling=”no” frameborder=”0″ allowTransparency=”true” style=”border:none; margin:1px 0px -12px 0px; overflow:hidden; width:450px; height:30px”>