This poll suggests that both adults and children are using social networking sites at a rising rate. How does this effect web reputation management? Sites like facebook, myspace, and LinkedIn are given much authority by Google–which means they appear in search results, generally. This can be helpful, or harmful, to your web reputation–this is something you should contact a professional about.
http://www.forrester.com/Research/Document/Excerpt/0,7211,55132,00.html