Hi, There are many other best social media marketing site other than Facebook: 1) Twitter 2) StumbleUpon 3) Digg 4) Reddit 5) Delicious 6) Google + Are the other major social media sites where you can get target for traffic and make their website good reputation. Hope this information helps you.
Facebook Linkedin Twitter Reddit Stumbleupon Digg used to be on there before the somewhat collapse. I find social bookmarking sites better than networking ones.
I really don't have 5 social networks in my mind, but following are the social network which I've used and still maintaining the accounts: 1. Facebook 2. Google+ 3. Twitter 4. LinkedIn