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Re:Ask HN: Is a user base growth from 190k to 3.3M in 4 year... by burnout1540 on Saturday April 04, 2015 @06:08PM (#9322386)
That sounds like registered users, which may be completely different than active users. The number of registered users tells you very little without also knowing the number of active and/or concurrent users and what type of activity they're doing.
Re:Ask HN: Is a user base growth from 190k to 3.3M in 4 year... by gt565k on Monday April 06, 2015 @12:08PM (#9328829)
I agree. Look at engagement rates and how the curve looks on that end. It is much more important than stale users who registered but never used your service/product.

Either way, I'd say a few million users is pretty impressive.

Re:Ask HN: Is a user base growth from 190k to 3.3M in 4 year... by seekingcharlie on Sunday April 05, 2015 @03:00PM (#9324964)
Agree that total users shouldn't be looked at without % of actives, but he's not asking if it's impressive from the POV of evaluating the business. He's asking in terms of evaluating an engineer who handled the scaling from a technical POV.