I would NOT recommend that you block or unfriend W through FB. Just keep that line of communication because of the context of your mutual RO. Speaking of which, what is the status of your RO? I am going to keep at it until we get some clear answers from your L.
Yeah, looking at W's FB can either be a positive thing or a negative thing depending on your perspective. It is all a matter of perspective. How you react to a certain FB post is strongly correlated to how you think of that particular person. All thoughts drive emotions/reactions.
