Sifter provides search and retrieve access to every undeleted Tweet in the history of Twitter. Users can submit three historical Twitter estimate requests per day using a variety of Gnip PowerTrack rules. When the query is done, Sifter generates an email estimating the approximate number of tweets responsive to the query and the cost to get access to the data via DiscoverText. Once the data is licensed by Texifter, we store the Tweets in a free trial Enterprise DiscoverText account where you can perform advanced text analytics to search, filter, cluster, code, and machine classify the data.