My only form of contact is Twitter for many people (they do not have my email). I posted my email publicly though when I tried to leave Twitter. Twitter is (to its benefit) an extremely low-friction form of communication that is not quite the same as email or a phone call. For example, I can say something on Twitter without demanding a given person's attention - rather, they can read it if they want to.
Anyhow, it was more a philosophical problem that brought me back. I said, in so many words, that I wanted to be more "zen" (whatever that means) and eliminate distractions. They argued that I was not in a "zen" place if I let distractions bother me in the first place. So I took it as a challenge (which I failed). I think it easier to turn things off permanently than to master one's own willpower.