From Fan History Wiki
- Guardian 8 was a Star Trek/Star Wars multifandom fanzine. It was 178 pages, published by Mazeltough Press of Seattle, Washington. It was published in December of 1988.
- On December 13, 1994, EMXC, an X-Files fan fiction mailing list, was created.
- In December 1995, Laura Goodwin posted Kirk/Spock limericks to alt.startrek.creative. 
- Between October and December 1996, the Mulder/Krycek Romantics Association was created.
- In December 1997, slash reached a critical mass in the X-Files fan fiction community.
- In December of 2000, Puppies in a Box, an NSync fan fiction site, went live. This site was very important in the history of the NSync fan fiction community. The site is now defunct. 
- In December 2000, Warner Brothers sent Claire Fields a cease and desist letter in regards to a Harry Potter related domain name she owned. In response to this, PotterWar was created by Alastair Alexander. Another fan group, Defense Against the Dark Arts, partnered with PotterWar to help them in their effort. There was cross fandom interaction at one point when both groups had some assistance from the BuffyBringers group. (MaryTheFan: )
- The Thin Line archive originally opened in December 2001 under the management of a Snape fan named Stacey (Yahoo! ID "dbzlives").
- On September 28, 2001, the mailing list WhenIKissedTheTeacher was founded. This mailing list, dedicated to the Snape/Hermione ship, saw its volume peak in December 2002.
- On December 13, 2002, The Legend of Zelda: Wind Waker is released in Japan.
- On December 13, 2002, the mailing list The_Chudley_Cave was created. 
- On December 13, 2003, fanfictions was founded on LiveJournal as a place for people to post BandFic. Among the fandoms represented were Good Charlotte, Linkin Park, Mest, New Found Glory, Simple Plan, and The Used. *
Recent days: December 12 – December 11 – December 10