Does anyone have a theory on what enabled Instagram to get to 27m users with only 13 employees in 2012, and why that still seems very difficult today despite all the SASS products helping startups?

Some game companies also used to release a new game monthly in the 90s, without code completion, Copilot, Git, Github!

gigameshmusic.com | formerly @optimism, @soundxyz, @farther

I think it was market positioning, Facebook had a terrible mobile experience at the time 

There was only 2 apps that were focused on photo sharing and they missed the mark. Ie; It took too long to post a pic and share it. 

Instagram focused on one thing the photo sharing aspect.