There are now half a billion active users on the photo-sharing app Instagram, the company has said.
More than 300 million people use it at least once a day, it added.
The service was bought by Facebook in 2012 for about $1bn (£677m), and has grown rapidly ever since.
According to the company, an average of 95 million photos and videos are posted each day. Co-founder Kevin Systrom said its success was the result of “a lot of hard work”.
In its five and a half years, Instagram has rocketed past Twitter, thanks in part to its adoption by high-profile celebrities and sports stars.
Instagram’s biggest competitor for youthful eyeballs, Snapchat, is understood to have surpassed 100 million users.