Instagram, welcome to the 100 million club.

The Facebook-owned photo sharing social network announced today that two-and-a-half years after launch, Instagram has surpassed the 100 million user mark.

Co-founder Kevin Systrom penned a blog post on the milestone, thanking users and writing about Instagram’s early days inside a frigid San Francisco office when he and Mike Krieger began realizing the power of image sharing.

“It’s easy to see this as an accomplishment for a company, but I think the truth is that it’s an accomplishment for our community,” Systrom wrote. “Now, more than ever, people are capturing the world in real-time using Instagram—sharing images from the farthest corners of the globe. What we see as a result is a world more connected and understood through photographs.”

This is impressive considering all the hoopla surrounding Instagram’s privacy policies in December. But it appeared the company recovered from that PR disaster when it reported 90 million monthly active users last month.

While the 100 million mark is nice, Instagram is still behind both Twitter, which reached 200 million last December, and of course Facebook, which now has one billion active users.

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