I really, really, really do NOT want to add my friend's fiance on Facebook. I think I should, though, because a) I see him at work, b) I went to her child's (his soon to be step daughter) birthday party, and c) I can see this having serious repercussions for her.
My question pertain's to "a" and "b". Would it be considered rude to not add someone who you may run into at work? Would it be considered rude to not add a friend's spouse when you went to their child's birthday party?