Facebook Inc (NASDAQ:FB)’s Chief Executive Officer Mark Zuckerberg is one happy customer as his recent costly conquest, Whatsapp, has reached a monthly active user base of 600 million users. Chief Executive Officer and founder of Whatsapp, Jan Koum, tweeted about the news of the milestone on Sunday. Whatsapp’s growth has been phenomenal this year after the news of the Facebook Inc (NASDAQ:FB) merger was made … Continue reading Facebook Inc (NASDAQ:FB) Has More Users To Playwith As Whatsapp User Base Touches 600 Million