message board

noun3

1. •
   A board on which messages may be posted, especially one in a public space.
2. •
   (Internet) A system by which users may send, read and reply to public messages; an electronic bulletin board or forum.

   • He busted in, blessed be the Lord / Who believe any mess they read up on a message board — 2004
3. •
   A communication board.

   • Disabled lesbian spells out 'I love you' on message board. — 1989