Hi F22, I would say you already took practical steps to protect yourself from future similar instances on FB. I can tell you that looking at FB pages for WAS is never a good idea.
What he posted may be to goad you and this is probably a good time to practice not reacting to his stuff. In fact I would say - get up & get busy for a while - let the feelings pass....
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus