I've been using BTCJam for almost 2 months now, I'm in positive territory providing the loans get paid back. There are a LOT of scammers there, and the fact that BTCJam get paid upon loan opening is definitely a problem and a bad idea. I've also joined BitlendingClub but not invested there. BTCJam uses a scoring system which I don't think provides much of a guide, however others may find it useful. The fact is that ID can be easily bought on the darkweb as can social accounts so they are not really a very secure form of verification. I go on the previous history of the borrower if they have any, and the description that they have placed on the loan.  I would definitely recommend Jam to anyone interested in crypto, as it grows the legit borrowers will easily outweigh the scammers and with the crowd funding nature of the site if you do invest in a loan, you will need loads of other people not to realise it's a scam for the loan to get activated, in practice this is the best security measure of all. The comments sections are censored far too heavily for my liking and I think this coupled with the 'earning from scammers' factor will ultimately be the only reasons I would leave BTCJam.