All Promos / Winter Bash
As 2012 came to a close, Stack Exchange decided to finish out the year with a little bit of fun...and hats! Users discovered hats by using their site in special ways, such as voting, posting on meta, editing posts to be better, and even chatting. The set included non-hat items such as glasses, headphones, bowties, and masks. Hat progress was trackable at a special landing page at http://winterba.sh, which included definitions and criteria. As a bonus, several hats were secret and only findable by the most diligent!