updated 03:17 pm EST, Fri February 28, 2014
iMessage sees exponential growth
Apple is currently handling about 40 billion iMessages (including push notifications) per day, and about 15 to 20 million FaceTime calls, CEO Tim Cook disclosed earlier today during the company's annual shareholders meeting. That indicates exponential growth during 2013, since in January of that year, the company was only up to 2 billion iMessages a day. Apple just recently added audio-only FaceTime calls as an option for iOS and OS X, which could grow traffic even further.
iMessage is said to handle "billions" of its own messages per day not including the push notifications, but is still playing catch-up with WhatsApp, the multi-platform messaging app now owned by Facebook, which sees about 50 billion messages each day (though a huge number of these messages are handled as push notifications, contributing to iMessage's total). It is also well in excess of BlackBerry Messenger, which despite being multi-platform, processes about 10 billion messages daily.