The extension is StayFocusd and it allows you to block any website on Google Chrome. This is so useful for keeping you off social media if you have study or an assignment to do.
The app grants you 10 minutes to spend on your banned sites before it blocks them.
This was a lifesaver for me last week because I had a crazy amount of work to do and COULD. NOT. FOCUS. I highly recommend it to any internet-addicts who need to get work done. This would even be helpful if you were just trying to cut down you time spent online.
The link to download it is here .
Good luck to any of you students out there slaving away!