Twitter is testing an ad platform, which is expected to be released next month, possibly at the South By Southwest event in Austin. Though the timing of the release has not been confirmed, Twitter's head of product management and monetization, Anamitra Banerji, told MediaPost that they "are working on an ad platform, but it's only in the test phase." According to Banerji, when Twitter does launch the product, it will make it clear when sponsors have paid for ads,