I have to agree when people say about the social networks: they came to stay in our lifes. When I saw the Orkut for the first time I really couldn't understand what hell was that. Nowadays, every week appear a new one: Facebook, MySpace, Twitter, Fluter and so on. Even the blogosphere can be considered a kind of social network.
In true, I wrote about social networks to introduce you in a very intersting one: the Livemocha. This social network is for language learning and meet people around world. The person can use the program to learn and make exercices. When you make your subscription and start the course you agree to help people that want to learn your mother tongue. That's the way Livemocha. Try it your by self.