Can one person make a difference?

I'm an optimist and believe that one person can make a difference. With all the ways that we can communicate around the world a person can influence and make a difference somewhere else. By just blogging farming stuff in Oklahoma could start a relationship with a farmer from China and through their mutual friendship learn from each other. Different people have different ways and who is to say which is better. It's not so much which is better but that there are two techniques now. To change the world you would need alot of influence, time and energy. You would need to sell your idea to the world. It is easier today to reach and teach people than at any other time in history because of the Inernt.