Facebook buys WhatsApp for $19 billion

WhatsApp, launched in 2009, is on the path to a billion users.

Social messaging app WhatsApp has 450 million users and is particularly strong in emerging markets.  It’s the most popular messaging service in countries such as Brazil, India and Nigeria

Facebook has stated that WhatsApp will continue to function autonomously and will remain advertisement-free.

Sources: BGR.com; Mashable.