According to this article - http://goo.gl/JA1wb Businesses are paying Twitter $120,000 to sponsor a promoted trending topic for a day, director of revenue Adam Bain told marketing news site ClickZ. Thats up from $25,000 to $30,000 when the feature was launched in April 2010. Anybody have any first hand experience with this?
Simply copy and paste the url below.
http://www.company.com/questions/Does-Twitter-Really-Charge-120-000-A-Day-For-Promoted-Trends/11821949174713237