Forgot to de-friend your wife on Facebook while posting vacation shots of your mistress? Her divorce lawyer will be thrilled.

Oversharing on social networks has led to an overabundance of evidence in divorce cases. The American Academy of Matrimonial Lawyers says 81 percent of its members have used or faced evidence plucked from Facebook, MySpace, Twitter, and other social networking sites, including YouTube and LinkedIn, over the last five years.