Twitter Headquarters, San Francisco, United States

On April 13, 2010, Twitter announced plans to offer paid advertising for companies that would be able to purchase "promoted tweets" to appear in selective search results on the Twitter website, similar to Google Adwords' advertising model. As of April 13, Twitter announced it had already signed up a number of companies wishing to advertise including Sony Pictures, Red Bull, Best Buy, and Starbucks.
Some of Twitter's revenue and user growth documents were illegally published on TechCrunch by the hacker Croll Hacker. The documents projected 2009 revenues of $400,000 in the third quarter and $4 million in the fourth quarter along with 25 million users by the end of the year. The projections for the end of 2013 were $1.54 billion in revenue, $111 million in net earnings, and 1 billion users. No information about how Twitter plans to achieve those numbers has been published. In response, Twitter co-founder Biz Stone published a blog post suggesting the possibility of legal action against the hacker.