Which is better for professional networking...FACEBOOK or LINKEDIN?

Jupiter media analyst Barry Parr was quoted in CNN Money to say, “At some point people are going to want to simplify. The open question that no one is really prepared to answer is how many networks do you really want to belong to?”
Facebook is making yet another headline. The social network is developing a new feature that will allow users to separate their work friends from their social friends.This feature however, could mean stiff competition for professional social network LinkedIn, whose focus is connecting people who work with each other.