If you need help remaining on task while doing research projects or other work (and who doesn’t every once in a while?), you can use technology to help. StayFocusd is a Google Chrome extension that limits the amount of time you can spend on distracting websites. Once you have set it up, you can prevent yourself from accessing Twitter, Reddit, or any other site for more than the allotted time.
If you need similar extensions for other browsers or for mobile devices, Lifehacker has a nice roundup of free and paid extensions and apps.