It can be a little bit of off-topic but this is a very interesting video that my communication professor showed class before. The video basically tells you how much the internet and the social media affect our lives these days. Even though we have already known that the internet is hugely influential, you'll probably be surprised while you watch this video.
We had discussed in class about how many books we thought there were in the world. This article explains how Google reached the estimated number of books.