Social networking is now part of our culture. In fact, there are so many to choose from and those who decide to become a member of one are more likely to become a member of another. Just to give you an idea of what is around, here are six of some of the most popular social networking sites.

1. The first is called Facebook. As of July last year, it has the largest number of registered users among college focused sites with more than 34 million members worldwide. Although it is the seventh most visited site in the US, it ranks number one for photos. What makes this social networking site so special is that it generates revenues through advertising which according to some is a little over $1.5 million a week.