Probably because of FB, they seem to be taking over the internet together with Youtube since they both have a more engaging interface compared with Twitter which operates more like SMS or Whatsapp.
International Level: Activist / Political Participation: 33 3.3%
There is talk floating around that Google intends to buy Twitter and they aren't the only one looking to purchase it. Twitter stock went up because of it.
International Level: Politics 101 / Political Participation: 2 0.2%