Wiktionary
n. 1 a board on which messages may be posted, especially one in a public space. 2 (context computing English) a system in which users may send, read and reply to public messages; an electronic bulletin board or forum.
Usage examples of "message board".
Maia recognized the genrevar-trashprinted on cheap stock to sell for the delectation of poor summerlings like herself.
She lifted her middle finger to the screen, and turned back to the message board.
A sailor with a message board entered, saluting as he shut the door with his other hand.
He was loading up the message board, demanding to speak to her directly.
Parnell stared back down at the message board, wanting to believe and fighting his own desires.
He started to reach for the message board Robards had left, but then he drew his hand back.
Commodore Perot was already there, and he turned quickly, a message board tucked under his arm, at his boss's approach.
In fact, his homely face (dominated by the craggy Webster chin) wore an expression of acute unhappiness as he laid a message board on the blotter.
The message board clicked as Robards set it on the corner of the desk.