Increasingly in the 2010s, radio personalities are expected to supplement their on-air work by posting information online, such as on a blog or on another web forum. This may be either to generate additional revenue or connect with listeners. With the exception of small or rural radio stations, much of music radio broadcasting is done by broadcast automation, a computer-controlled playlist airing MP3 audio files which contain the entire program consisting of music, commercials, and a radio announcer’s pre-recorded comments.