In the 1980s and 1990s, Bulletin board system (BBS) provided more communal ways of communicating and sharing messages. In these systems, someone would start a “thread” by posting an initial message. Others could reply to the previous set of messages in the thread.
I think its interesting how someone can make a code where announcements are made and other can add onto to it and make messages out of it. Leading this to make a entire interface is very interesting!