A number of people associate social network with Facebook. Well, it’s understandable for it is the most popular today.. But do you know that there are other social network as popular as Facebook? Take for example the Plaxo a very popular social network among people who are over 65 years of age. While Facebook is more popular with women, Digg and reddit is known to be popular to men. There is also the linkedln which is popular among the rich and plurk which is the preferred network of well-educated people with graduate degrees.