According to a survey, 33 percent of U.K. divorce petition refer to Facebook as a reason behind a split.

Have you ever been caught flirting on Facebook with someone besides your significant other? Apparently you're not alone.

A new survey conducted by U.K. divorce Web site Divorce-Online found that married couples are increasingly being driven apart by transgressions that occurred on the popular social media site. So much so that 33 percent of divorce petitions in 2011 contained references to Facebook, according to the survey.

Moreover, the amount of Facebook-related divorces ratcheted up in recent yearssubstantially, according to the survey. In 2009, the last time the survey was conducted, Facebook was mentioned in just 20 percent of divorce petitions. In both cases, 5,000 divorce petitions were queried by researchers.

As in the 2009 survey, the most common reason for citing Facebook in a divorce petition related to a spouse's behavior with members of the opposite sex. Also, spouses used Facebook to comment about their exes and used their public walls as "weapons in their divorce battle," the survey states.

The top three reasons included: inappropriate messages sent to members of the opposite sex; separated spouses posting nasty comments about each other; and Facebook friends reporting a spouse's behavior.

"People need to be careful what they write on their walls as the courts are seeing these posts being used in financial disputes and children cases as evidence," Mark Keenan, a spokesman for Divorce-Online, said in a statement.

However, Facebook denied the claims.

"It's ludicrous to suggest that Facebook leads to divorce and we would suggest that anyone who purports to have conducted surveys about the topic also ask respondents about other popular communications such as text messaging, chat sites, and email," Facebook public policy manager Fred Wolens said in a statement.

Twitter, meanwhile, appeared in a mere 20 divorce petitions queried by researchers. Those cases commonly involved Twitter being used as a tool to make comments about exes.

Editor's Note: This story was updated at around 3pm EST with comments from Facebook.