Why Twitter May Have the Edge in Online Ads

For all their popularity, social networks have turned out to be barren soil for advertisers. Facebook famously has 901 million users, but it only saw $4.12 in revenue from each of them last year. Twitter has taken even longer to implement a business plan for monetizing its 140 million users. But as it reveals its strategy, it's starting to look like it may have an edge over Facebook in selling...