Not that I know of. It would have to be the LinkedIn before it became just another avenue for self-promotion and advertising for courses, seminars, etc.
Anecdotally, it doesn't appear to be any good for job searching. Lots of un-directed random messages from recruiters, but no real job sourcing.
It seems to be the fate of all socially oriented networking sites. They devolve into yet another advertising, spam delivery mechanism.
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