Wait, what? How did yet another instant messenger client get a million users in 2 weeks?
From Thursday, 3 days ago. I looked around the blog, it seems they "went viral" around November 1st. I also found a claim they're getting 3 new registrations per second. Very strange, but also fantastic if it's real!
I don't have any of these devices it supports, but I get the impression the cross compatibility is what caused the popularity.