I leave my wife's FB page alone and she leaves mine alone. Neither of us have anything to hide from the other or any reason to be suspicious or jealous of the other. She is very rarely on FB and never gets any/many messages there in the first place. Whenever one of our mutual friends posts something of interest, I usually have to ask my wife if she has seen it (and she often has not).
I think FB is great for staying in touch and catching up with old friends, but it can be dangerous with some relationships.