I quit facebook back in March. Yep, some people don't talk to me anymore. But you know what? I talk with other people more, and I'm enjoying those relationships more.
It's also hard; this is a top-of-class addiction. There's nothing easy about rewiring the reward circuit of your brain. And definitely Facebook, work email and in my case ycombinator news, are wired in to the reward circuit - for the relief of boredom, or even the relief of hard work (or the appearance of that relief anyway.)
A lot of people say this one (usually about Facebook), but I don't understand it. If you want to talk to those friends, why doesn't it suffice to schedule spending time with them in the same way you would have done it in 2000?
Phones and email still exist. If your relationship is predicated on a single internet based communication service then it's probably not a relationship worth maintaining.
Just use a different communication mechanism. It's really not that hard.
Send a postcard, it's fun, I promise.