Saw it on a poster. Read it in a newspaper. Read it in a book. Heard it from a teacher. Heard it from a friend.
Communication is really the transmitting of ideas from person to another.
Communication is transmitting ideas from one person to another. But the idea itself is affected by the way it is transmitted. The statement about world starvation might be more believable, say, if you read it in a book that was all about world hunger. Who or where the information comes from is also important. Your friend might not be the best source of information on the current world economic situation, but he or she might be an expert on the school hockey team or a community enivronmental issue.