How should we evaluate tools for thought? There's no simple metric, as far as I can tell. The best tools change your paradigm anyway, so your old metrics (books printed per year?) aren't what matter. Here's one (vague, but focusing): how much meaning is unlocked on the margin?
I'm not sure I conceptualize twitter in that way at large... perhaps there's a difference in how it might best be used and how it gets used on a population level. I might make personal connections. I might also get Inceptioned to act or think different politically.