20% growth per month in itself has such a non-meaning. It really depends on where you are coming from. If you start with 10 users in month 1 all you need is 90

20% growth per month in itself has such a non-meaning. It really depends on where you are coming from. If you start with 10 users in month 1 all you need is 90 users in month 12 to have 20% MoM growth. Well, that's doable. If you start with a million though you need to have 9 million by the end of said year. Tougher to find 8 MM new users than 80, don't you think? If you're someone like Facebook with a billion users, good luck finding 9 Billion after 12 months of growth ;)