Facebook closed the first quarter with 1.45 billion DAUs, up 13% from the year-ago period, with the platform's MAUs also up 13%—and these figures don't include Instagram or WhatsApp. Facebook's impressive user base across multiple platforms has helped it turn into a money-making powerhouse that dominates the advertising business along with Google ( GOOGL - Free Report ). Last quarter, Facebook reported revenues of $11.97 billion, with ad sales accounting for roughly 99% of total Q1 revenue.