Social Networking sites

I have a paper focus on the topic of “Social Networking sites have redefined the meaning of personal portals.” Critically examine this statement by reviewing the evolution, features, power and benefits of social networking-based personal portals e.g. Facebook, Friendster, MySpace, Squidoo, LinkedIn, Ning. You may focus on one or more or these software and include screenshots for illustrations.” I need a detail outline of this topic.?for the first point you should point out the development of personal portals. then u should continue giving face bookas an example of personal portals and based on that explain benefits and risks