According to divorce lawyers, the social networking site is being blamed for a growing number of marriage breakdowns.
They claim that almost one in five divorce petitions cite Facebook as a factor in the decision to separate.
Mark Keenan, managing director of Divorce-Online said: “The most common reason seemed to be people having inappropriate sexual chats with people they were not supposed to.”
The lawyers pointed out that social networking cites can tempt some people to cheat on their partners, while suspicious spouses have also used them to find evidence of affairs.
But even when husbands and wives have remained faithful, flirting and sexual banter on Facebook is still being used as grounds for divorce.
There are several dating applications on the site that allow members to test their compatibility with others.