I downloaded the "Self Control" app today (free for Mac), and I must say, it worked like a charm.
"Self Control" allows you to block any feature on the 'puter (mail & websites) for a pre-determined amount of time, and once it's set into motion the timer cannot be tampered with. It can't be undone by restarting either! I think most people use this to keep themselves away from Facebook, but since I avoid that like that like the plague it's all book-sites & time-sinks for me.
Holey Moley! I blocked myself for three hours and got nearly an entire chapter written, plus some good editing and plotting done. It was downright comical how many times I automatically tried to log onto Booklikes or e-bay. I blocked Goodreads, Pinterest, Tumblr, and my Amazon sales figures too ;)
This way, all of the usual suspects are off limits, but I can still go on Bing or Google and do research while I write.
I expect to be exceedingly prolific this year, LOL.
Kitty say thumbs up :)