According to CEO Jan Koum, it has more active users than Twitter, and pushes more messages than Facebook.

FORBES: Nimble Messaging Apps Could Challenge Facebook's Mobile Success

Talitha Koum has already started preparation work on the Hope Centre, near Ipswich, but wants to have the building finished by next year.

BBC: Talitha Koum sets ?500,000 target for drug rehab centre

There are really only two people who can stop Facebook from buying WhatsApp: the WhatsApp founders, Jan Koum, 36, and Brian Acton, 40.

FORBES: Why Selling WhatsApp To Facebook Would Be The Biggest Mistake Of Jan Koum's And Brian Acton's Lives