FB wall posts are reasonably public, are you sure you want her airing her laundry there? If you block her, FB won't notify her, but she will eventually figure it out and that will lead her to pursue you in other ways if she wants something from you.

Also, if you block her it will make it easier to detach and go dark. That's my $0.02, you have to do what's right for you obviously. I was trying to help on the thread "Am I Getting Flushed Down the Toilet" and his W started posting pics on FB of herself with OM, changed her status to "Single", etc. That didn't help the guy's state of mind at all -- better not to look.

Accuray

Married 18, Together 20, Now Divorced
M: 48, W: 50, D: 18, S: 16, D: 12
Bomb Dropped (EA, D): 7/13/11
Start Reconcile: 8/15/11
Bomb Dropped (EA, D): 5/1/2014 (Divorced)
In a New Relationship: 3/2015