answer:I can help you with OS X. The best app I found is called SelfControl, and it’s free. There is one downside (I consider it to be the REAL benefit) of this app: You specify a black list, and you specify a time period during which it gets blocked (say next 2 hours for example). During these 2 hours, you can NOT access the website even if you delete the app or restart the computer, so it’s not like those silly browser plug ins that allow you to switch off the filter whenever you want. I used it for 2 days only, and it somehow taught me how to control myself without using the app. I don’t know of any similar app for Windows. Good luck!