BTCJam has great potential, but the defaults are a problem. And the general rules avoid the possibility of trying to get money back too
2. Late Payments
Under no circumstances should you attempt collection on a late payment yourself. In doing so you run the risk of creating a legal liability for yourself and the website cannot be hold responsible.
Lenders may not post pestering or threatening messages on any listing.
Failure to follow these policies may result in termination of membership.
So Tulkas is doing nothing to recover money (5 weeks and no words on that too), and there is no possibility to obtain data to try to recover yourself money
There's not a whole lot that CAN be done. First and foremost, its not "money". It can't be sent to collections, no agency will buy a debt in bitcoins, credit or widgets. Collection agencies buy debt for a percentage. Because there's isnt a fixed exchange of bitcoins-to-dollars no collection agency will pay anything for any bitcoin debt. There isnt anything to buy as far as the law is concerned. It's been discussed here in the past, but you aren't going to be taking anyone to court claiming they owe you USD because a make-believe exchange named after Magic The Gathering says your coins or credits are worth so-much. It just isnt happening. Sorry.
BTCJam is a great idea. I wish I could've invested more and made more than I have so far, but it is getting so unbelievably unreliable (not the site, but the users) I'll be pulling my bitcoins as quick as payment come in (IF they do)
Nothing against Tulkas, he did a good job with the site, but in the end there is NO WAY to collect bitcoins owed. It just doesnt exist yet