http://mashable.com/category/whatsapp?utm_campaign=&utm_context=textlink&utm_medium=rss&utm_source=">WhatsApp, the popular messaging service Facebook purchased last year, now has more than 900 million users — eclipsing services such as WeChat, Facebook Messenger and Line.
CEO Jan Koum revealed the new milestone on Facebook Thursday during a casually-worded check-in with...
