This extension tracks how much time has been wasted with facebook and twitter open.
Time Wasted is an extension that allows the user to track the amount of time they spend on a variety of social media sights. Sites currently supported are Twitter, Reddit, and Facebook. The extension only tracks time on the current tab, and does not count time when the computer sleeps.
The github repository for this project is: https://github.com/bmchrist/facebook-wasting
More features coming soon!
Such as Dynamic URL Tracking and user profiles