At my place of employment we blocked Facebook and Twitter on computers. The area where I do work the average age is between 18-22. You would have never guessed the outrage of us doing it, like we were cutting off a body part.
Imagine having your tongue cut out. Social media is how they talk to each other. I've witnessed a large group of teenagers in the same room not speaking to each other directly but over their phones/ipads/electronic devises/etc. I honestly thought it was a joke and they were putting on a show initially. It amazed me.
I have no doubt that KF has lost recruits over his no twitter rule. People may laugh at that statement but twitter and social media is their lifeline to the rest of the world.