I think Bitcoin has been mentioned on big sites because has aroused a huge curiosity due to the fact that the Bitcoins price has reached an incredible value in a short period of time:$1150.And only within a month.I have also seen  on many sites last month, people asking about Bitcoin and how to acquire Bitcoins.So,it is no surprise to me that Bitcoin is in the center of articles on many famous blogs and sites.This way Bitcoin will be more known around the world and till now who had no idea what Bitcoin is has the possibility to  find out more about cryptocurrencies and starting to want to invest in Bitcoins through work online or buying them via fiat.