Think of it as like wearing a Helmet-It's just smart.
#1 Don't be posting your personal informationDon't post your full birth date, phone number, your address. Even if your setting are set to private don't post personal information. People can hack in and get your information so it's best to never post it. Also, if friends post some of your personal information-feel free to ask them to take it down. Better safe than sorry. (1,2)
#2 Use the privacy settings
Although these settings are 100% fool poof (what is these days) they are there for a reason and keep those unwanted predators out of your business. Make it difficult for just anyone to read your business. (1)
#3 Cite sources
If you want to be safe. Keep it legal as well. Using pictures of information cite your sources. Follow copyright laws. You don't disgruntled people coming after you and you also want to give yourself credibility by citing sources. (3)
(1) http://security.rit.edu/dsd/bestpractices/socialnetworks.html
(2) http://money.cnn.com/2005/04/08/technology/personaltech/blogging/index.htm
(3) http://weblogs.about.com/od/bloggingethics/tp/Top3BloggingRules.htm
photo courtesy of Haley Phippen