Forum

noun

1. A place for discussion.
2. A gathering for the purpose of discussion.
3. A form of discussion involving a panel of presenters and often participation by members of the audience.
4. An Internet message board where users can post messages regarding one or more topics of discussion.

   "Trish was an admin on three forums, and had no trouble at all when it came to moderating them."

5. A square or marketplace in a Roman town, used for public business and commerce.