discussion group
noun
1
: a group of people who meet to discuss shared topics of interest
… every Sunday for most of one school year Ellie went to a regular discussion group at a nearby church.—Carl Sagan, Contact, 1985
2
: an electronic forum devoted to a particular topic : newsgroup
Today a troll is someone who deliberately sends a rude or annoying message to a discussion group on the Internet.—Ruth Walker, The Christian Science Monitor, 6 June 2011
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Merriam-Webster unabridged
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