Hmm, my linkedin and facebook networks are almost entirely separate and I really want to keep it that way. now having said that I wouldn't mind my facebook peeps getting near my linkedin stuff, but wouldn't want my linkedin crowd going near my facebook page. i actually just decoupled my twitter feed from my linkedin account, because i didn't think it was appropriate... some tweets wouldn't do my chances of getting hired much good.

hope that helps. maybe that's just me.