The new facebook privacy controls were exactly what I was looking for.  Currently I keep a seperate LinkedIn profile for my professional contacts, but there are certainly times when those two groups get blurred and I'm left to wonder if I should accept a facebook invitation from a future employer (which really happend).  This forced me to clean up my facebook profile (read: make it much more boring) and accept.  But now that will no longer be an issue.

The question is now - What does LinkedIn offer that facebook doesn't?  I've written before that I beleive a fundamental difference between Facebook and LinkedIn is that Facebook is the private me (for only my friends to see) and LinkedIn is the public me.  But if I can provide and update both personas from one content source - why use two different sites? Seems to me that LinkedIn is headed for a sad fate.  I guess the question in the long run is - Will people want to keep multiple profiles or can every site just leverage the content I post to Facebook?