According to a survey by Websitemazine.com the top 5 social media sites are:

1. Facebook
2. Twitter
3. Linkedin
4. Youtube
5. StumbleUpon
   

   WebsiteMagazine Social Media survery 2010

Website Magazine also learned from the suvery:

• 81.7% of those surveyed said they will commit more time to social media
• 43.2% of websites are B2B and 56.8 are B2C
• 58.6% see a positive ROI in social media
• 66.3% say that they get more website traffic as result of their social media efforts