Since leaving Google (GOOG) several years ago, where he last worked on wireless spectrum issues, it’s hard to say exactly what role the digital jumping bean who is Chris Sacca plays.

He’s not an entrepreneur, although he seems to know all of them in Web 2.0 world and advises 18 start-ups. He’s no longer a big-company exec, although he was one and knows a lot of them too. He’s not a venture capitalist, although he is involved in a private equity firm and invests in a lot of the start-ups he advises, like the red-hot Twitter, and knows those guys too.

Of course, Sacca blogs and tweets a LOT, even as he travels incessantly to Ethiopia, Dubai, and various places where Bono might be hanging.

(Thus, don’t miss this very funny mocking of Sacca’s tweets under the name fakesacca, reportedly done by Googler Dick Costolo, with pitch-perfect tweets like: “Wow, not sure what city i’m in. The food says London, the prices say Tokyo, and the women say Los Angeles. I’m going w/ Hong Kong,” “Going over my SXSW talk on ‘why I should have equity in your startup.’ Getting inspired just proofreading it” and, my personal favorite, “If you’re pole-dancing & heli-skiing & in the ny times w/in 12hr of each other, something has either gone horribly wrong or horribly RIGHT!”)

With all this dabbling Sacca does, BoomTown has decided to dub the Silicon Valley gadfly: The Start-Up Whisperer.

Here is my video interview with him, about those start-ups like Twitter and about what’s next in tech innovation, all while a lovely piano player at San Francisco’s Zuni restaurant tinkled in the background: