There are over three billion internet users

"Over three billion people are now online and information and communication technology (ICT) growth remains buoyant in just about every country worldwide, according to ITU’s flagship annual Measuring the Information Society Report.
The report is widely recognized as the repository of the world’s most reliable and impartial global data and analysis on the state of global ICT development, and is extensively relied upon by governments, financial institutions and private sector analysts worldwide.
Latest data show that Internet use continues to grow steadily, at 6.6% globally in 2014 (3.3% in developed countries, 8.7% in the developing world). The number of Internet users in developing countries has doubled in five years (2009-2014), with two thirds of all people online now living in the developing world.
Of the 4.3 billion people not yet using the Internet, 90% live in developing countries. In the world’s 42 Least Connected Countries (LCCs), which are home to 2.5 billion people, access to ICTs remains largely out of reach, particularly for these countries’ large rural populations."

Source:  Press release from the ITU, 24th November 2014

Full report here