After months and months and months of speculation, Twitter is finally unveiling its long-awaited business model. Starting tomorrow, the company will sell ads — called “Promoted Tweets” — that show up at the top of the results when a user searches on Twitter for a specific keyword. The ads, which themselves are Tweets, will only show up if they meet something Twitter is calling a “resonance score” — which factors in how often the message is being retweeted, as well as how many people are clicking on a link if it’s included. Advertisers get charged per thousand views — although Twitter says that eventually advertisers will be charged based on the “resonance score” of their promoted Tweets.
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