Publicly-traded social media sites will be reporting their financial results for Q4 2015 soon. As part of their financial reporting, they usually provide an update on the usage of their platform. In advance of Q4's update, here's a look at the reported data for Q3 2015. It is worth noting that Pinterest is not publicly traded and therefore does not report usage on a regular basis. The statistics for Pinterest are the most-recently metrics that they have stated publicly.