The "anonymous and sometimes sketchy rides posted every year" line is particularly irksome as it so perfectly conveys the annoying disdain techies have for things that don't sport a slick iPhone app and/or (attempt to) make money. The truth is (confirmed over many hours of conversation with fellow riders and drivers) sketchy rides are both obvious and exceedingly rare. A few simple rules (like physically talking to the rider/driver ahead of time, meeting in a public place, etc.) are sufficient to ensure a smooth experience.