How can this be reduced?

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Today the internet have become where useless people upload their phonographic pictures. Some have displayed their naked pics to be seen on the net and I do feel it is very bad to nature and humanity not to talk of religion. The reason why am saying this is cos am working in a cafre and I have seen different people to come to look at those pictures n when I started chating newly in yahoo messanger, I met a friend who asked me to click a link and when I did it, I saw her pics naked. I am not happy about this. What do you think can be done to reduce it? Eventhough it can't be totally erased. Your response will be appreciated. Thanks