Internet forum
From wipipedia.org
An Internet forum is a web application which provides for discussion, often in conjunction with online communities. Older forums date back to around 1996, following the newsgroups and bulletin board systems which were widespread in the 1980s and 1990s. Popular discussion topics include technology, computer games, and politics, but forums are available for any number of different topics (including, of course, BDSM).
For a full description see the the wikipedia aricle on Internet forums
