Social Networks++ & Cloud++ = Social/Pro. CLOUD

Well, it is so long time that I'm using social networks, the 1st one was Orkut four years ago and a year ago I started using Facebook. I don't want compare them, my subject is something else, but as a personal opinion Facebook is really great invention as everybody knows it.
It's about three days that I've felt in a large bunch of these networks and my huge interest to join them and test them.
I tested about 5 of them in just one day. The great things here are the APIs which connect all of them together, even your Yahoo!, Google, AOL and etc. This is why I inserted '++' in the Title.

You know, this is the Cloud. A social cloud which everybody can use in his own method, Social or Professional.