I use this tip to improve my productivity everyday. Its incredibly simple.
Simply make a list of any tasks that you dont require the internet for, for me these are usually all writing related. If you need to research do your research first.
Then.... UNPLUG YOUR INTERNET CABLE!
Spend 1 - 2 hours a day in complete 'cyber' isolation. I shudder to think of the amount of time I waste doing things like reading blogs posts, checking email, forums or messenger popups. Take away the temptation and I guarantee you'll get a lot more work done.
Hope this helps