I did an interview for an app I love using called Freedom. Basically I pay them to block off the internet on my computer on a timed basis (6am-3.30PM, Monday-Thursday) because I have all the willpower of an unrepentant addict when it comes to the twittah.
And yeah, I get that the least productive thing you can do is write about productivity. But there you go. Have a read here if you like.