It's a nice sentiment, but the products/sites/apps that aim to suck our attention are designed to exploit human weaknesses via dopamine release, variable reward etc. (see the book Hooked), making it exceedingly difficult and potentially expending your finite store of willpower on things you could much more easily avoid altogether.

Personally, cultivating the self-control to avoid checking facebook.com is less interesting to me than editing my hosts files to block it, and using my willpower for more rewarding tasks (exercise, learning piano etc.)

With that, I'm turning my block back on HN :)