A post to DeepField blog by Craig Labovitz claims that "Sometime over the last month, Google quietly broke an Internet record. Based on measurements of end device and user audience share, Google is now bigger than Facebook, Netflix and Twitter combined .. When we last published some large-scale measurements in 2010, Google represented (a now seemingly small) 6% of Internet traffic. Today, Google now accounts for nearly 25% of Internet traffic on average. Only Netflix has larger bandwidth, but Netflix peaks last only for a few hours each evening during prime time hours and during Netflix cache update periods in the early morning"
See "Google Sets New Internet Record" - here.