According to Nielsen, we spend one out of every 4.5 online minutes visiting social sites and blogs (a stat that seems low to me). That kind of use can put a pretty big dent in your workday. A developer named Fred Stutzman couldn’t control himself. So he made an app that, when launched, prevents him from visiting a selection of sites (from Facebook to Youtube) until he reboots his computer. It’s called Anti-Social.