Instagram has 1.25m users per employee

"Yes, Instagram now has five million users. That’s 625,000 users for every month they’ve been in existence — with the growth accelerating. Just this past weekend they added 100,000 new users, for example. Even more amazing, there are now 1.25 million users for every one employee of Instagram.
I got a chance to catch up with Instagram co-founder Kevin Systrom this morning to talk about the milestone and the bigger picture for the service. Beyond the five million user mark (which they actually hit yesterday), Instagram is about to hit another huge milestone: 100 million photos. They’re at 95 million right now, and they’re adding roughly 860,000 a day. In other words, by the end of this week, the total number of pictures should cross 100 million.
For comparisons sake, it took Flickr two years to hit 100 million photos. Again, Instagram, just eight months. If you still had any doubts that a mobile photo revolution is happening, there you go.
As for the burgeoning Instagram ecosystem, Systrom says that there are now 2,500 unique apps out there accessing their APIs. Remarkably, they are also seeing some 350,000 connections across their API, meaning that some of the apps connected are massively popular. Which are the most popular? Webstagram and Flipboard were the top two the last time he looked, Systrom says. There are also now applications pushing photos into Instagram — not through the API, but through more creative means."
Source:  TechCrunch, 13th June 2011