A message board generally consists of a number of specific discussion topics, each with numerous messages written by users. Message Boards comprise a huge community of web users, in which you can discuss, debate and make new friends.
People use message boards for a variety of reasons.
Some people use them to discuss subjects of interest to them. Some people use them to meet new people and find folks with similar interests. Some people use them for romance, some for business advice, and some to just pass the time. As a form of communication, message boards fall somewhere between a personal email and an announcement over the radio. Be smart and use normal precautions when posting.