Sosh, a service that gives people interesting and personalized local recommendations, has been live in San Francisco for a little more than a year. The company combines a heap of analysis of online postings with a sliver of hands-on curation to figure out good stuff to do.

In San Francisco, the site and app have signed up one in eight people between the ages of 21 and 40 (and these are real people; Sosh requires Facebook Connect). In certain circles — and not just the techies — you hear about Sosh all the time.