New York Post:

A whopping 81 percent of matrimonial lawyers say that in the past five years they've seen a massive spike in the use of social-networking information as evidence of infidelity, a new poll shows.

The most widely used cyber-evidence -- including messages to lovers and incriminating photos -- is found on Facebook, the survey from the American Academy of Matrimonial Lawyers reveals.

Huffington Post Article:
http://www.huffingtonpost.com/2010/02/11/facebook-helps-divorce-la_n_458406.html

New York Post Article: 
http://www.nypost.com/p/news/national/facebook_em_19o6ShnvKhE8MtIiAcLHxH