According to a sign in the front window of Famous Fabrics on Beacon Avenue, the yarn and cloth shop has its own Twitter account through which interested parties can stay informed of all the store's latest news. 'Check us out on Twitter!' reads the poster, as do two smaller page-sized printouts affixed to each cash register inside. 'And become our 'friend' on Facebook!' At press time, the store's Twitter feed, which can be found at www.twitter.com/famousfabrics, comprised two posts spaced two weeks apart. 