I don't know your sitch but caught the thread title. I started FB because I learned about my H and OW were friends on FB too. It really corked me. So I got an account and friended both of them. Duh. Would you be surprised that neither one of them accepted? LOL

Time has passed, my H is here and in his own way working with me on our R. We are still not FB friends, but we do have about 40 friends in common.

I heard a news piece that said it was better if spouses are NOT FB friends. I agree.

As for liking something on her page to show you are the bigger person, why not tell her you appreciate what she does rather than like it?

Live your life while you are still living.
Riding the trail less traveled.