ma.gnolia

Just wondering if anyone has used the social bookmarking site ma.gnolia for their students? I have tried but find the password business too hard to negotiate (even for myself). Is there a good tutorial online somewhere? It looks v. attractive and would appeal to ESL and/or low-level literacy learners and seems a great way to organise information to share but I'm being held up with discovering what's good about it. Maybe it isn't as good as it looks, though.