One of the biggest impediments to my own productivity are the time wasting sites -– in particular Facebook and YouTube. I enjoy both sites, so I do not want to totally ditch them. Not only does Facebook keep me connected, but as I mentioned before, it is how I keep up on reading interesting articles.
However, during times of stress I tend waste even more time by checking Facebook way too often or getting lost down the black hole of amusing YouTube videos. This is why I now use an awesome app called anti-social (Mac or PC). Antisocial tells you to choose an amount of time, then choose URL domains to block during this time. It can also block you from email during that time. For me, it is Facebook.com and YouTube.com. I started with antisocial's suggested 45 minutes, but am increasing the blocks of time to one hour or more. This is about being intentional in using your time to be productive.
If you need even more restriction, you can purchase Freedom, which blocks all internet access. This doesn't work for me, as I am often doing academic research online. But this may work for you.
If you’re like me, sometimes you lose a little self-control during high stress periods. Using these types of apps can help you stay on target, keep focused, and be productive.