This infographic from statista provides an extensive overview of Internet usage by the numbers.
Here are some key stats:
In 2014 the number of Internet users has reached 2,923 million. That's nearly 40 percent of all people on Earth.
By the end of 2015, global internet traffic will add up to one Zettabyte (A Zettabyte would be a HD movie with a running length of 36 Million years).
People spent most of their time on gaming (32 percent) and social media sites (28 percent).
See rest of the stats in this chart.
