People often assume that when they post something to Facebook or some other social networking site, the post fades away after a while. And they'd be wrong.

It's becoming more and more common for Facebook posts, pictures and updates to be used as evidence in court cases relating to child custody or divorce. According to Patch.com, one attorney says that Facebook-related appears in nearly every child custody case.

One classic example is a man who posted about taping a picture of his child's mother to his punching bag since he wasn't able to punch her for real. The child's mother ended up winning primary custody.

In another case, a husband created a bogus Facebook account for his estranged wife. He posted fake updates and racy photos in an effort to make her look less than professional. The ploy didn't work; he was discovered, and she emerged victorious.

Attorneys say that evidence relating to Facebook is more common in child custody cases than it is in divorce. But Facebook is actually becoming a factor in why people decide to divorce in the first place. In many cases nowadays, attorneys say, someone will decide to divorce after discovering their spouse was having an affair. More and more often, infidelity is fueled by social networking sites such as Facebook, which make communication far easier than it used to be.

For some people, quitting Facebook would be the equivalent of conquering an addiction, but some say that anyone involved in a family court matter should do just that: Quit it.

Source: Patch.com, "Facebook may be used against you in court, local lawyers say," James Myers, Feb. 1, 2012