Pulling the plug on products it has acquired or developed for huge sums is not unusual for Google. This week, Google killed two social sharing applications, Bump and Flock. Google got it hands on the apps when it acquired Bump, with backing from high-profile venture capitalists Andreessen-Horowitz and Sequoia, for an undisclosed sum last September. But those weren't the only products Google's dumped over the years. Here are the top-10 products that Google has discontinued.