One in five divorces in the US now involve Facebook, according to research, which has uncovered a rise in lawyers' use of social media for evidence of cheating.
In a many divorce cases, married partners have used the social networking site to get back in touch with old flames.
Sites including Twitter and MySpace were also found to play a role in a growing number of divorce cases says the survey from the American Academy of Matrimonial Lawyers.
But Facebook is the main offender: it has been cited by 66 per cent of lawyers as the primary source of evidence in a divorce case.
The survey found that 80 per cent of divorce lawyers reported a spike in the number of cases where social media is used to prove infidelity in the form of flirtatious messages and photos.
Last year, a UK law firm carried out similar research which highlighted that one fifth of its divorce petitions also attributed blame to Facebook flings.
'The most common reason seemed to be people having inappropriate sexual chats with people they were not supposed to,' revealed Divorce-Online's Mark Keenan.
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