bulletin board
A corkboard where things like notes, pictures, and notices can be posted. The phrase can also refer to an online service with the same function. I did post signs for my event on the bulletin board in the dorm, so I don't know why no one came.
bulletin board
Also, electronic bulletin board. A computer service that provides facilities for people to leave messages by phone or telecomputing. For example, The National Writers Union has a bulletin board through which members communicate via their modems . Both the device and the term, alluding to the older board for posting notices, date from the late 1970s.