We've seen third-party studies on what makes a tweet succeed, like this one, for example. But Twitter went ahead and did a study of its own, looking at more than 2 million tweets from verified accounts in the United States. What it found was that adding video, links and photos all result in

Twitter is planning to introduce its advertising products to nearly 50 more countries as it seeks additional revenue outside of the U.S., Twitter executives announced yesterday at a festival in Cannes, France. According to a company spokesperson, Twitter's Promoted ads suite, which includes Promoted Tweets, Promoted Trends and Promoted Accounts, will roll out in Latin America, the Caribbean, Spain, Italy, Germany, France and the Netherlands later this year. Promoted ads are currently only available to marketers in the U.S., U.K. and Japan.

One day after returning as head of product, Twitter co-founder Jack Dorsey said the micro-blogging service's ad products could use more cohesion. "I think the biggest challenge is tying them all together," he said. The comment was a reference to Twitter's three core offerings for marketers — Promoted Trends, Promoted Tweets, and Promoted Accounts.

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