Real business contacts are not established via sites like LinkedIn. A decade ago I made a reputation of high-load backend developer and people are still approaching me via 2-3 chain links. Literally today I've got yet another offer to join a MMOG project as a CTO despite of the fact that I haven't been working on publicly known MMOG projects for several years. LinkedIn founder monetized a dick-measuring-contest idea, good for him. If one day I decide to create a profile and get thousands contacts I'll use my photo in bikini with photoshopped boobs as the avatar.