Chan: refers to a younger person; usually family members use this word only .
San: approx. equivalent of Mr. or Ms.
Interestingly enough, Chan my be a insult to some teenagers–who may like Japan and the Japanese culture, but who want to be recognized as being a lot older in their own culture or local area, and hold different values that may not necessarily include the idea of Kawaii. Thus San is a safe bet to try first if unsure–in most cases should you be unsure of the local customs or what the values of the person has on the internet.
-  direct communications with with people
-  Wiki: http://en.wikipedia.org/wiki/Japanese_honorifics
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