Don't post any of those "inspirational" posts. Especially if they can be construed as pro staying married. She'll see right through that and it'll push her more.

I'd say to either go FB dark (just read, no posting or commenting/liking) or just unfollow her and only post things that involve the kids. Not a bad time to break the FB addiction.

Me: 34 W:33
T: 10 M: 6
S: 6 D: 5
BD: 5/14
Still together(ish)
Not giving up: 7/14
D talk has slowed, a lot.
Gradually working on things together. Still separate bedrooms.
Slow and Steady wins the race.