Instagram is a daily habit for more than half of the photo-sharing social network's users, co-founder Kevin Systrom said at a press event Thursday in New York.
He also noted that, in general, photos taken have more than quadrupled from 86 billion in 2000 to 360 billion in 2011.
The main event of the press conference was the unveiling of Instagram Direct messaging.
Ahead of the event, it was unclear just what the photo-sharing social network would announce, and speculation ranged from a photo-printing service --Instagram has grown rapidly in the three years since it launched. With 150 million active users worldwide and -- to a private messaging service that could rival Snapchat and WhatsApp. , it recently started running advertisements in an effort to bring in more revenue.