How many of us get lost when we are on the internet. We may just need to check one email or a quick news update, but all of a sudden 30 minutes go by and you have no idea why you are reading that particular article. It happens to me a lot. I get lost all the time.
One of the rules that I have, I stay off the web until after I complete my run. There have been times in the past, where I literally wasted my workout time, just to read some dumb articles or check sport scores that would not matter if I checked an hour or two later. How often are you on facebook or tweeting?
Prioritize your run and get it done before going on the computer. You will be very happy with the results.