The geniuses of Lifehacker wrote a cool piece of articles describing the difference and the usage between the major Social Networks (they choose Facebook, Twitter and Buzz). Of course, there is tons of other social networks over there, each of them having specific way of working and on specific locations and geographic zone. But this article offers a good view on the differences between each networks and how it works.

Check it out 🙂

http://lifehacker.com/5472223/which-social-network-is-right-for-you