I have witnessed many websites using Twitter to promote e-commerce in a variety of creative ways.  Most recently, I participated in a ModCloth.com giveaway.  ModCloth sells vintage items from dresses to apartment decor.  They do not have a physical store, so they have had to rely on Internet Marketing and word of mouth to expand their customer base.  When they got to a large number of followers on Twitter, ModCloth “celebrated” by giving away a $1,000 gift certificate to their site.  It understandably got a lot of press on Twitter, with new people following them to participate in the contest.

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