@anonymint, abandonment, which is difficult to accurately measure anyway, can be almost entirely ignored as a growth statistic if you compare active accounts over time. Daily active has been growing significantly and is now close to 6000 from being closer to 4000 not long ago (1-2 weeks IIRC, but I don't have hard numbers). I'm not sure about the weekly-active numbers as I haven't paid attention to it.
I agree with the earlier comments that: 1) constant growth is not exponential; and 2) there isn't enough data to conclude much yet, except that there is steady, but still kind of slow growth, even after factoring in abandonment.