Facebook like button group connection issue

Recently I got the idea to link my forum to facebook so I could get more traffic, but when 开发者_如何学CI changed the href URL to the group (http://www.facebook.com/?sk=group_166066160111619) it kept giving me errors... Is there any way to link my facebook group with my site to allow likes?

I have tried your approach, linking the group URL to the Facebook developer page, and got the same error that you explained above.
If you open your Facebook group, you will see that there is no like button link there, instead it has a "Join group" link. Therefore I guess it is not possible to have a like button pointing to this group. However, you can have a like button pointing to a Facebook page (not a group), as Facebook page has a like button in the profile page. The following page http://bugs.developers.facebook.net/show_bug.cgi?id=10674 discuss about similar issues.
Hopefully Facebook will provide solution for this soon. Hope this helps !