The funny thing is that, the person who just left my friendster, then added me to his facebook. I had a chat with Edo at the time and Edo suggested me to send him a message:
Sorry, only accept both friendster and facebook, not separately.I actually never met that guy. He was a client, we exchanged emails. I think it's probably worthwhile to maintain this kind of relationship, although for such I'd rather use linkedin. Hmm... maybe I should ask him to connect to my linkedin (I'm thinking of asking one of my teacher too. I found his linkedin once and he only has one connection, probably the guy who invited him in the first place. Poor Harry)
So basically, in the social-networking-sphere, I know everyone in my network except a very few people that I added by accident, mostly because I thought he/she was someone else or we've met somewhere. Except for goodreads. I add everyone to my goodreads. As long as we read the same books, we are friends.
After all, 68% of these accounts are fake.