From Facebook Developer Wiki

[edit] FQL and fb:grouplink

SELECT gid FROM group_member
    WHERE uid IN (
        SELECT uid2
            FROM friend
            WHERE uid1 = *****
    )

Will sometimes return a gid that fails in the grouplink tag. I do not know why. I am just some dude. Thank you.

Here's the error:

Errors while loading page from application
Runtime errors:

fb:grouplink: "2255860028" is not a valid group id

This tag does not appear to work for ANY of my groups. It ALWAYS returns 'is not a valid group'. The group ids I try ARE valid. Can someone fix it?

>>> I have been having the same problem for 2 months. Anyone get this to work?

STILL BROKEN, WHEN WILL THIS BE FIXED???