Facebook has 955m users, including 543m on mobile

"In its first results presentation as a public company, Facebook announced revenues of $1.18bn (£750m) for the three months ending 30 June. The results were just ahead of analysts' expectations and came after US stock markets had closed.
Facebook's shares had been falling all day on Thursday, ending down 8.5% at $26.84, as investors feared the company would miss analysts' projections. They continued to fall in after hours trading, dipping below $25 for the first time since May's initial public offering.
The company reported it had 955 million monthly active users as of June 30, 2012, an increase of 29% year-over-year. The number of mobile users reached 543 million as of June 30, 2012, an increase of 67% year-over-year. For the second quarter, Facebook posted a loss of $157m."
Source:  The Guardian, 27th July 2012