We’ve seen the Instagram community grow from 1 million to over 15 million users in 2011. To celebrate, we’re recapping the year’s activity in our Year in Review series.

Accounts

• 1 million: The number of accounts on Jan 1, 2011.
• 15 million (and counting): The number of accounts on Jan 1, 2012.

Photos

• 3: The average number of photos uploaded per second, one year ago.
• 60: The average number of photos uploaded per second, today.
• 400 million: The total number of photos shared on Instagram so far.
• 51,600+: The most likes on a single photo.

Photos by irenesco, tvwithcheese, hammo85, hacchi312 & arielvargasruiz.