Bumping for this neat twitter game you can play on Halloween:

http://cthalloween.pbworks.com/

How To Play

Step 1:  Follow the Twitter account @cthalloween

Step 2:  Pick one of these four character types to portray on Halloween: 
The Questing Professor, The Tormented Artist, The Suspicious Citizen, or The 
Gibbering Cultist. If you're especially ambitious, make up your own character. 
(Need help choosing? Read the individual character timelines below the F.A.Q.)

Step 3:  Throughout the day on Halloween, you will get tweets from @cthalloween 
with story prompts for each character type. Follow the suggestions that apply 
to your character, or veer off on your own. Use Twitter, Facebook, your blog, 
or any online method to describe what you're seeing, what you're doing, and how 
your life is affected by the rise of the Great Old Ones.

Don't forget! Tag all your posts with the hashtag #cthalloween. This allows us 
to track everybody's contributions.