Online social networks are handy not just as a means of wasting time but also as a communications tool for business. Dell, a computer-maker, has made $3m in sales from Twitter since it started "tweeting" about its outlet that sells refurbished computers in 2007. Marketers are eager to use fast-growing networks to tout their products. An Australian online-marketing company, uSocial, wants to help them-for a price. On September 16th the firm started selling Facebook friends and fans.
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