Google earns a fortune out of URL typos

According to a couple of Harvard University click counters, Google could be earning close to half a billion dollars a year out of adverts placed on typo-squatted sites. The Harvard researchers Tyler Moore and Benjamin Edelman say it is "difficult to know exactly how many people visit typosquatting domains." That doesn't stop them having a go and providing estimates of the number of visitors reaching typo sites (thinq www.microsft.com) as well as the fees advertisers...