According to OgilvyOne's Mandel, seven times more people texted in their responses than those who called in the company's 1-800 number that was also in the advertisement.

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Those bodies could bring to three the number of deaths connected to an advertisement placed on Craigslist seeking a caretaker for a 688-acre cattle ranch outside Akron, Ohio.

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Mr Cox also suggested that increased competition due to a larger number of channels available would increase pressure on advertisement-funded channels.

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With text messaging, applicants can text a phone number listed, for example, on a bus advertisement and immediately receive a link to job openings.

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So, although the new car in the advertisement may look like the old one, the external form conceals a number of significant changes to the engine.

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Facebook offers both cost per click, for which advertisers pay only when users actually click on the advertisement, and cost per thousand impressions, for which advertisers pay based on the number of times these advertisements are displayed on user pages.

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