<http://schema.org/description>
"With 450 million active users each month and 1 million new sign-ups per day, WhatsApp is indeed the world's most popular messaging app.\r\n\r\nHowever, figures revealed today show that ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apps/2014/03/19/whatsapp-rival-wechat-is-narrowing-the-gap-as-it-passes-355-million-monthly-active-users/>