Most people think big companies use grammar very well. Many people wondered about Apple's use of grammar with its "Think Different" advertising campaign in the late 1990s. A new study shows that big companies make grammar mistakes. The proofreading website Grammarly.com looked at the writing of six of the world's most famous companies. It found that they all made mistakes. It also found that the companies who made the fewest mistakes made the most money. Grammarly compared the comments made by the companies on the social network site LinkedIn.com. It looked at the spelling, grammar and punctuation errors in 400 words of text from each company.

Grammarly compared the mistakes made by Coke and Pepsi, Facebook and Google, and Ford and General Motors (GM). It found that Coke made four times fewer writing mistakes than Pepsi. Coke has a bigger share of the cola market than Pepsi. Google made nearly four times fewer mistakes than Facebook. It also makes a lot more money. Finally, GM made more mistakes than Ford, which is a more profitable company. It is unlikely that the occasional grammar mistake will make you buy a Coke instead of a Pepsi. However, Grammarly CEO Brad Hoover said: "Accurate writing demonstrates professionalism…and customers are more likely to buy a product or a service from a company they trust."