[yannickt]

"and LinkedIn is toast" I doubt that. I think people who take career networking seriously tend to keep their personal and professional lives separate.

[d2viant]

I'd venture to guess that nearly all LinkedIn users are on Facebook, but I don't think the opposite is true. Along with that the information recorded under both sites overlaps quite a bit. At that point it's just a matter of how and to who you show your information on Facebook. I don't think Facebook is the least bit worried about LinkedIn.

[Retric]

Hours spend doing social networking things on sites other than Facebook cost Facebook money and relevance. Also, plenty of "important" people avoid Facebook like the plague because it's a time sink, so there is plenty of pull in the other direction.

[JanezStupar]

I'm nobody important - however I resist creating a FB account and each day I am more pleased with my decision.

And I would sooner create LI account than FB. I am also very careful about what information I release about myself to the world.

But we are few and far in between.