Could you tell me my balance, please? 40 mg lipitor recall As far as where the promoted tweet appears, they appear at the top of search results. Prosser specified how these tweets are purchased and how their appearance occurs: “The Promoted Tweet that appears there is determined by a real-time auction where advertisers’ bids and the engagement level of their Tweets are used to determine a winnner (similar to AdWords, if you’re looking for an analogy — except in this case, there’s only one ad slot).”