This is a full and complete list of Social Networking sites you probably won’t find anywhere else. I don’t even use all of these. I would not have enough time in the day to use all of these.
There are 269 social sites and 187 video networking sites.
So use what you want and leave the rest. Come back anytime and add some to your list.
Networking Sites (110) Google Page Rank
Networking Sites (187) Google Page Rank