Social media sites have clout. They are the virtual malls and burger joints of earlier eras. They connect people through social networks. More kids hang out in them than you can imagine.

You're nobody without your own MySpace profile or until you're invited into somebody else's space. More and more advertisers have MySpace accounts where they are talking directly to kids about hamburgers, movies, videos, CDs, and more.

Some sites have more clout than others. For instance, 81% of visitors to ...