Twitter has doubled in size over the past nine months. From one million total users to two million.
What’s really interesting, though, is that it has kept a steady number of active users over this time: 20%.
This is a really high DAU rate and points to a depth of engagement not found, for example on Facebook apps. Most apps on Facebook have a DAU in the 1-2% range [there are exceptions, of course, like the massively mulitplayer game Imperial Galaxy – DAUs have reached as high as 30%].
I’m sure both the rate of growth and the level of engagement are factoring heavily in the current financing round Twitter is going through.
My current favorite Twitter apps:
* Twhirl, an Adobe Air-based Twitter interface, recently acquired by Seesmic;
* Twinkle, an iPhone app that taps into other Twinkle users in a specified radius – great for swarming.
[via Techcrunch, disclosure: I am Chairman of Creative Enclave, the makers of Imperial Galaxy]