If you haven't heard of it, SketchFactor is a new app that uses crowdsourcing to tell you when you're in a "sketchy" area and what kind of incidents have occurred nearby.
The app has been receiving a lot of negative criticism lately for inadvertently being totally racist. But that aside, some individuals in San Francisco (and everywhere else presumably) have been using the app for much more hilarious purposes. Namely, poking fun at the city's techies, yuppies, and hipsters. Here's just a few examples: