The hot thing at SXSW is location-based anything. (I’m so cool, I don’t even need to be there to know this.) But I’ll bet every single geek pushing a location-based app at SXSW is missing the point. You should sign up for location-based social media. So cool people can avoid you. Here’s the deal – there are some people I’d rather not see. (Oh come on, don’t...