That's fine and valuable, but it doesn't sound like much of a moat. Those thought leaders used something else before Twitter - even if it takes a while, it's not a crazy idea that they'd eventually move somewhere else if the grass is greener.
What is this "something else" that you refer to? In fact, this kind of short-form, global conversation wasn't happening before Twitter, at least not on their scale.
I'm sure MySpace thought the same thing about their never-before-seen accomplishments. I suspect very few people knew what "something else" was in that case, either.
