Beyond the tools, like Twitter and FB, what are some proven strategies or creative concepts that you have seen companies employ to build their brand. For instance, one company I know of, is currently doing a promotion where if people at WholeFoods where stripes, they signal that they are interesting in hooking up. Or the hipster did a post on hacker news that got him 10K sign-ups in 2 days.
So my question is, what examples or just ways of thinking would you offer for how best to start meaningful social media campaigns?