Since launching just six months ago, Instagram has quickly become one of the web’s top photo sharing services. The company recently passed the two million user mark and announced the launch of their API.

RJMetrics sampled data from that API and loaded it into its Dashboard for analysis. This yielded detailed new insights into Instagram’s growth and user adoption. I provide a full breakdown below, but here are some highlights:

• Instagram is currently adding 130,000 registered users per week
• Instagram’s 2.2 million users upload 3.6 million new photos per week (or 6 photos per second)
• 37.5 percent of registered users have never uploaded a photo
• 5 percent of users have uploaded over 50 photos
• 65 percent follow nobody, and only 12 percent of users follow more than 10 people
• For users who upload at least one photo, there is a 45 percent chance they will upload a photo the following week
• Those same users have a 25 percent chance they will upload a photo 12 weeks later, representing a significantly stronger retention rate than Twitter.

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Instagram Now Adding 130,000 Users Per Week: An Analysis