Need to Back Off The Internet. Use A Little "Self Control"

The app is dead simple to use. Just add any domain to the blacklist (like twitter.com), use the slider to set the time you need to block those distractions (from one minute to twelve hours), and click Start. SelfControl’s timer counts down the time until you can get your next distraction fix, and in the meantime, all attempts to access that site will result in a dead page. SelfControl works in conjunction with any application on your Mac, too, so you can’t just switch browsers and expect to get your fix elsewhere. Click Here