I post on FB against vet advice. I don't feel like emotion is a bad thing, and I don't give a fig what gets back to BF. I'm an open person by nature and it's not something I feel needs to change.
That said, I limit what I say to whom. I have a close trusted friend's filter, that I whine to when my PMA is low, and everyone else (including mutual friends) get the general updates and the "I so liked my old life, but I'm also happy with where I landed" posts.
BF has me blocked on FB anyway, and for now I blocked all the mutual friends that might post info I can't handle. I saw pics not too far back and my emotional reaction wasn't pretty.
That's my two cents.
ME: 38 BF: 40 T: 10y, no kids, no M (by choice) BD: 7/14/14, BF admits to PA, wants out, lies about new R. 10/1/14: I move out, BF lies about move in with OW 12/4/14: OW confronted, reveals all the lies