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1.
A condition where a person constantly updates their Facebook status. This is usually classified when a person updates their Facebook status more than 5 times an hour. Also classified as when a person uses Facebook updates like Twitter.
Her facebookarrhea was clogging my update page.

See twitterrhea blog-arrhea facebook whore facebook junkie facebook
by Jakerie January 26, 2010
 
2.
Simply posting too much on FaceBook, to the point where the poster is wasting time, or the readers are getting tired of it.
I've been posting new things for two hours now; I must have FaceBookarrhea.

Fifty percent of my Top News is from Devon. That guy's got FaceBookarrhea again.
by Sausalito Kid November 29, 2010