Coworkers on Facebook

Is it me, or do other people think it'd be weird to have your coworkers on your facebook list? If I were to be completely honest, it really isn't of interest to me to know the social/personal lives of the majority of my coworkers. If it were, I'd probably ask. Perhaps that sounds a bit harsh doesn't it. Maybe I need to work on that. Not that it means adding my coworkers on facebook anytime soon.