Not in US, but it's absolutely big in Asia. http://gigaom.com/2013/11/26/study-facebook-messenger-still-reigns-in-the-u-s-but-other-countries-look-to-whatsapp/

Not in US, but it's absolutely big in Asia. http://gigaom.com/2013/11/26/study-facebook-messenger-still-reigns-in-the-u-s-but-other-countries-look-to-whatsapp/ http://gigaom.com/2013/11/26/study-facebook-messenger-still-...