My Dad, who is 85 and going strong and still married to my Mom, always says you can never be friends with your ex. Ironically, my ex friended me on FB a few months ago but it's been so long (20 years) and we're 3,000 miles away from each other, that I figured no harm could come of it. But as a rule, I wouldn't friend an recent ex. My husband isn't on FB and frankly, I'm happy about that. Not that I'm trolling for dates or anything (hardly) but I like having a place to hang out without having him know every crazy thing I say or post.