Facebook gives you the means, the excuse and the cover to communicate with people you have no reason, no business, to talk to.
I found one of my best resources while struggling through this was the book by William Harley Surviving the Affair.
One of the components of this site has always been to give both points of view.
Likewise, many homes had being broken and other relationship dreams shattered.
I believe you can vent without generalizing about or hurting other people.
They assume the fault of their unhappy marriage is only the ohter spouse.
If the answers are yes and no respectively, signs are that somebody is cheating on Facebook.