Increasingly people accept that Facebook serves a different function than LinkedIn. In simple terms: deals on LinkedIn, dates on Facebook. This simple reality was obscured for a while, because the Silicon Valley crowd use Facebook (as it is the new, new thing) and so they extrapolated incorrectly that the rest of the world will work that way too. It looked like a contest between the Facebook hipsters and LinkedIn suits. But the real race for business networking has two horses. LinkedIn is clearly one. The other is not Facebook, but Xing.