Unfortunately, this is not always possible, and personal contact is neither appropriate nor economical for reaching large numbers of people. Telephone calls are fast and effective for networking. However, they are limiting for the same reasons as personal contact and prevent the use of visual aids. Traditional mass media reaches many people simultaneously. However, mass media reaches most people only once and only if they are tuned in.
Repetition tends to become very expensive unless it's a short public service announcement.
Fortunately, mass media productions or other messages can be made into a tape for later replay at home or in meetings. However, they usually become dated since the material cannot easily be altered. Newspaper articles capture timely events and reach many people. However, fewer people read newspapers today than in previous decades. Slide presentations are flexible and can easily be modified to include new weeds or information, and status updates.