I am sharing the library that I've been accumulating for 15 years by giving some of it away. Every day I will pick a good window well in Soho, deposit some books, and immediately tweet the location with a photograph and the hashtag #LostLibrary.
These are books for people to browse and to take away if they like.
Documentation is archived on flickr and tweeted photos are posted to tumblr.
Begun on June 19th 2011, Lost Library is an ongoing social media performance.