Also, 80% of divorce lawyers reported an increasing use of social networks to engage in extramarital affairs! We're coming across it more and more," said clinical psychologist Steven Kimmons of Loyola University Medical Center, "one spouse connects online with someone they knew from high school. The person is emotionally available and they start communicating through Facebook. Within a short amount of time, the sharing of personal stories can lead to a deepened sense of intimacy, which in turn can point the couple in the direction of physical contact."
This is not to say that the spouse in question is necessarily making the social contact with any sort of wrongful intentions, though. In fact, most of these online relationships begin simply through innocent curiosity. Whether it be an old friend, an ex, or a current significant other, as with any relationship, it all comes down to the amount of time two people spend in contact with each other. Online or off, the more time someone spends in contact with another person, the more likely they are to develop feelings for each other.
http://www.omg-facts.com/view/Facts/27675