Facebook Mobile chief Erick Tseng spoke on stage this week about the upcoming nirvana that we can all experience when superphones let us know what’s going on around us. You could walk by a Starbucks, he said, learn its exact location, get a coupon for it, and notice that two of your Facebook friends are in the store at that moment. The tools to make this happen are coming soon, and that could boost Facebook’s already-big mobile audience of 150 million users.

Tseng was one of the top speakers at the MobileBeat 2010 conference this week in San Francisco. Here’s a part of the Q&A between VentureBeat chief executive Matt Marshall and Tseng on video.