The phenomenon has become Tumblr's Newton's Law: For every great fandom, there's an equally vocal anti-fandom, bringing it down a peg or three.

By Aja Romano — May 22

A misinterpreted Tumblr reblog set off a turf war between two of TV's strongest fandoms.

By Aja Romano — February 22

Tumblr has long been the mecca for rabid "Teen Wolf" fans.

By Gavia Baker-Whitelaw — February 20

After 10,000 entries, MTV selected Riana Elliot's "Side Effects" as the winner of its fanfiction contest. 

By Aja Romano — October 02

After over 4 million votes were cast, "Sterek"—the same-sex pairing of Teen Wolf leads Stiles and Derek—came out on top of a poll that fans helped inspire.

By Aja Romano — September 24

Teen Wolf fans are baking cookies for show creator Jeff Davis to persuade him to pair up the show's two male leads, scoring a trending Twitter hashtag along the way. It's so crazy that it just might work.

By Aja Romano — September 20