San Francisco is experiencing another explosion in startups, and one of the best ways to visualize that is at at the local tech community's hottest recurring event, which is the "startup mixer" held by SF Beta every other month at 111 Minna.
SF Beta is the brainchild of Christian Perry, now 26. He launched it when he first moved here from Chicago after finishing college back in 2006. Perry notes that his meetups are attracting record crowds these days.
"There is a big spike this year, up to 650-700 attendees, or more than twice as many as in the past," says Perry.
Almost all of that growth, he says, is due to the rise of social networking companies like Twitter, mobile app developers, and new advertising startups, which have catapulted San Francisco into the new center of tech innovation -- more than anyplace else, including Silicon Valley.