Availability in the digital teaching world

Let's start with a true confession: I'm addicted to digital media. Email, Twitter, texting, Facebook, Instagram--I compulsively check them all. 

But during the summer, it's just for me and it's just for fun. But during the school year, it's a different story. Email used to be the only digital portal for student communication. But now Twitter is too. And last year, my students figured out that if they want a fast response, Twitter was the way to go. And I would be tweeting back at 11 pm. Which is a problem.

I'd like to train my freshmen to be pro-active with the help they need, and, more, I'd like to draw a boundary between my work and my life. But how to go about this on my end of things? Defeat my digital addiction (which may or may not be a good thing for my overall well being), or try to limit my responses to work-related items? In this 24 hour digital world, what is the line between work and home lives? As a teacher, it feels like this is getting blurrier and blurrier, and I'm not sure how to best address it...

But I'm open to suggestions...maybe you could tweet them to me...?