Keeping personal information out of Google
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=164133
Remove content from someone else’s site
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=1663688
How do I remove a tagged photo or post on Facebook?
https://www.facebook.com/help/?faq=140906109319589
Article on employers asking for Facebook passwords.