The DataSift HTTP Streaming API allows you to subscribe to DataSift streams using HTTP streaming. This DataSift client opens an HTTP connection and consumes DataSift content passed along that connection until one of the parties closes the connection. Please make sure you've looked at the Streaming API introduction. There are step-by-step guides and code examples for a variety of client libraries.
DataSift provides real-time, human-generated data including social data, blogs, and news data.