If you have been ripped off, or otherwise scammed by btcjam, leave trust for tulkas here:

https://bitcointalk.org/index.php?topic=112447.msg15613889#msg15613889

If you have been scammed by members and have their dox, here is the thread to post them in.

https://bitcointalk.org/index.php?topic=605994.msg12536615#msg12536615