Tara Fritsch, a marriage and family therapist from Oklahoma, says up to 40 percent of couples who come to see her there because of Facebook or Myspace affairs.

"We see about 40 percent of the couples coming in, there is a link to Facebook or to MySpace that has caused a breach in their marriage," says  Fritsch. "An ex-love, an old flame - there's a nostalgia there. There's memory of the simple days or maybe excitement of new romance."

Fritsch warns that online relationships start to go out of control as soon as people start saying things they don't want their spouse to see, things they might hide and things they might not be confortable saying in person. Basically, this means they go out of control as soon as they start.

Even if the connection is not physical, there's a good chance it can create a mess, as according to research, emotional affairs can be just as damaging as sexual affairs.

More here.