Browser addons can help avoid distractions
I find that I am easily distracted with semi-productive sites on the Internet. I like Reddit for lots of reasons, but one of my favorites is that I can restrict the subreddits that get displayed to me. I have subreddits like /r/hardscience and /r/chemistry on my front page. While this is great, it tends to lead to my reading Reddit when I have other priorities that I know are higher. I found that the firefox add- on called Leechblock helps me focus [edit: I use Freedom.to now]. There are more, similar plugins for other browsers.