Bit of research on audioboo3 May 2014 13:30
Number of registered users
30 Sept 2012 - 600,000
30 Sept 2013 - 1,700,000
That's an extra 1.1m users = 3,014 added per day on average but UBC at the time that 5000 users were being added per day.
At Dec 2013 (bit vague) - 2,000,000 users
At 16 April 2014 (found on one of ONE Delta's RNSs) - 2,400,000
Therefore the number of registered users has grown fourfold over 19 months. Registered users doesn't equate to active users but that's nevertheless very impressive.
But, from 30 Sept to 16 April, the average number of new users per day is about 3,530. Not 5,000 a day but still an improvement.
I've also recently been trying to work out why it's growing so fast - why people would use it and I came across this:
https://audioboo.fm/about/social_blind
It's a superb social media platform for the visually impaired, and therefore still very exciting!