Ever wondered why those crazy fools at Facebook think it's a good idea to meddle with the timeline, or how you chat? Well you can blame yourself. Probably. The social network's Director of Engineering, Andrew "Boz" Bosworth, reveals all in a recent blog post. By first explaining that the site evolves in a two-step process, "technology pushes people to move forward and then people move past technology and it has to catch up," we can start to understand why constant user testing of new, often multiple, solutions is required. Boz goes on to explain that by using select groups, or even nations, the efficacy new features can not only be quickly, and solidly determined, it can actually supplant the need for weeks of boardroom debate. He goes on to say that the odds are that everyone on Facebook has been part of a test at some point. Curious to know more about the process, or just feeling a little bit used? Head over to the source link for the full post / comment thread.