Top Tweeting Bookstores

NFI Research listed the "top independent bookstores on Twitter" in the U.S., ranking them according to bookshops that
1) regularly update their page and communicate with their followers
2) use Twitter to advance/promote communication with their community
3) have a proportionate number of followers to following and
4) are active on Twitter as of October 19, 2009."

The top 10 indie tweeters:
Powell’s Books, Portland, Ore. @Powells
Tattered Cover, Denver, Colo. @tatteredcover
Harvard Bookstore, Cambridge, Mass. @HarvardBooks
Skylight Books, Los Angeles, Calif. @skylightbooks
Vroman's Bookstore, Pasadena, Calif. @vromans
Book Soup, West Hollywood, Calif. @BookSoup
WORD bookstore, Brooklyn, N.Y. @wordbrooklyn
Book Culture, New York, N.Y. @bookculture
BookPeople, Austin, Tex. @BookPeople
Metropolis Books, Los Angeles, Calif. @Metropolisbooks

Report from Shelf Awareness.