Somebody has suggested to me, just before I cut all contact, that I contact everybody on his and her friends lists at Facebook and tell them, without bitterness or vindictiveness, the real story of what happened.
HELL NO!!!
Exposure should only be done to a VERY close group of people (OM/OW's spouse, employer if the affair is happening at work, adult children and maybe a BEST friend), and really should only be done to try to save the marriage. Your timing would seem to be off, but regardless, I would NOT recommend that you tell this many people! "a" you'll come off as mean, weak and vindictive, and "b" if you DO reconcile later on, you will regret having told so many people.
