Nielsen now measures Twittering of shows...

[Kayarath]

http://www.nielsen.com/us/en/press-room/2013/nielsen-launches-nielsen-twitter-tv-ratings.html

Nielsen, the thing that rates how popular TV shows are, will now take into account twitter activity in measuring show popularity! That means TWEET ABOUT ANIME! DO IT NOW!!!!

[Elk]

Doesn't really reflect how popular something, just how rabid twitterfolk are about something. Superfans can make 100 tweets an hour about something they're passionate about.