User growth on http://econtwitter.net seems about linear? No idea if it will keep up.
@paulgp my bet is that eventually it is going to have a log curve. Right now you have mostly early adopters, but once their excitement will decrease it will take some time to build legitimacy and slowly attract late adopters.
@yyarmar That seems right to me! And the difference between users (people who signed up) and active users (people who stick around) will be interesting.
@paulgp any curve is a line if you look close enough. Wait a little bit 
@paulgp This is genuine fun, I am afraid its a bit of a distraction as well as the world is really on a tipping point. But this is an investment that will be vital for the coming weeks, whatever come -- especially in the US.