Most companies target early adopters with their new products, hoping those users will tell all of their friends all about it. But not GrandCentral, the company Google acquired for $50 million in July 2007. They just pulled off a huge marketing stunt, and it appears to be working. GrandCentral hasn’t actually launched - it’s in private beta and you have to get someone to invite you (get one here through our InviteShare service). On Wednesday, though, the company announced that any homeless person in San Francisco will soon be able to sign up and get a free local phone number and voicemail. Mayor Newsom then threw in a bunch of sound bites about how this will “empower” the homeless, ...