WhatsApp has today announced that they have now reached 400 million active users, which is a huge increase of the 350 million active users that was announced in october, and the 300 million from August. To top all of which off, WhatsApp also revealed in June that it had handled 27 billion messages in 24 hours.

Also just to compare, Twitter only has 233 million active users.

Jan Koum, CEO of WhatsApp, wrote the following in a blog post to celebrate:

“We bet that if our team of engineers could make messaging fast, simple, and personal, we could charge people directly for the service without having to rely on annoying banner ads, game promotions, or all those other distracting ‘features’ that come with many messaging apps.”

In case you don’t know, WhatsApp is a mobile messaging service that allows users to send texts, photo, video and audio messages for free over the internet.

Source: WhatsApp – App Store

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