I know it is easier to not compulsively check FB, mail, etc. when I'm supposed to be working on other things if the tabs are not open.

However, I have just discovered that using break time to check FB and mail (since the volume in both cases is small) significantly reduces the amount of willpower required to go back to work -- possibly from the little success-spiral boost of having Completed A Task.

Wondering what other break activities could also serve.