The main student unions on administrative and policy issues are the McMaster Students Union for full-time undergraduates, the McMaster Association of Part-Time Students for part-time undergraduates, and the McMaster Graduate Students Association for postgraduates. In addition, each faculty has its own student representative body. There are more than 300 student organizations and clubs, covering a wide range of interests such as academics, culture, religion, social issues, and recreation. Many of them are centred at McMaster's student activity centre. "The Silhouette", the student-run newspaper, is the oldest student service at McMaster University, in publication since 1929. Since 1968, the McMaster Engineering Society has published "The Plumbline", the main satire magazine of McMaster University. The campus radio station CFMU-FM (93.3 FM) is Canada's second-oldest campus radio station, and has been broadcasting since 1978. MacInsiders, a once-popular online student-run forum and information network, had been operating from 2007 to 2019 and had over 18,000 registered members. The McMaster Artificial Intelligence Society, or Mac AI, was founded in December 2017 and has grown to be one of the largest undergraduate AI organizations in Canada — around 5% of the McMaster student population is a general member of the club.