> Communication via those alternatives is extremely limiting.

I disagree with this characterization of the alternatives to Facebook and Twitter. In fact, I find it hard to dispute that the popular alternatives are considerably more open-ended, more secure, and apply much less censorship.

However, for the sake of argument let's assume the characterization is a fair one: that one's communications are limited when using an alternative social network where fewer people are registered users. Under this circumstance, what right does any of us have to reach the kinds of people Facebook and Twitter offer?

Perhaps we shouldn't necessarily consider it "limiting," when we are unable to reach all stretches of the globe. One's ability to be "heard," really falls outside their full control as soon as one wants to be understood past the walls of the current room.

I stand corrected, there are reasonable alternatives to Facebook. But Twitter seems to be a unique channel for global communication. You may be right that we shouldn't expect to have global reach, but if some people have that opportunity while others are denied based on the content of their message, how is that fair? Isn't it up to individuals to reject the message or ignore it if they deem it offensive?