Freedom releases white-listing for Windows:
Whitelisting or Block All Except … allows you to block the entire internet except for the websites you add to your exceptions list.
Thus, with white-listing, you don’t need to positively identify what online distractions you want to avoid. You just need to identify what online you need to be productive.
For instructions about how to use white-listing on Windows, see Freedom’s original post.
For more about using Freedom to support your priorities, see this post.