Facebook's acquisition of WhatsApp for $19 billion in cash and stock. Whats App has attracted users by offering the messaging service free and 99 cents for the second year for sending apps and pictures. It has grown rapidly in its international user base, and has in the space of 4 years since starting up in 2009 built a user base of 450 million users. About 70% of users go to the site daily compared to 61% for Facebook. Facebook pays $40 per user similiar to what is paid out for other social media sites. The main advantages are to protect Facebook as the trendiness of Facebook declines- if youngers cool to the site- by adding a popular messaging site, the international base of users, and the large number of users. A Ukrainian Jan Koum, who worked for 10 years at Yahoo, and Brian Acton founded WhatApp.