BizSugar.com › Startups › WhatsApp, The Anti-Marketing Growth Phenomenon - GrowthHackers

Jan Koum founded WhatsApp in April of 2009, and the earliest version of the app was available for download in Apple’s App Store the following month. Run on the programming language Erlang, WhatsApp is a cross-platform messaging app that serves as a reliable, affordable alternative to SMS and MMS—for which carriers often charge per-message.