Theoretically, you can't stop people from talking a certain thing; but in practice in you can always increase the cost to reduce the efficiency of communication, especially you can gain a lot of advantages if the effect is on a massive scale, statistically...

And when you increase the cost to such a extent that people get more hassle from talking than get more benefits from this same act, people will simply stop doing it...

A simple example, I am right now typing on my tablet, and I do have to admit that I was a bit hesitant before I start writing this message...it's just much more comfortable to type on a real keyboard than the tablet screen...but I hate censorship and mind control so much that overcomes my reluctance to type on a tablet...

Btw, please don't downvote or upvote my post...I am currently at 256 karma units...I think it's cool and want to maintain this karma for a while...thanks...