I came across a good discussion on the topic here at Baidu. Interesting discussions.
Btw, I thought about it before reading that, and decided to give most of my earnings to OCEF. Today I saw my name on the report. Good: really I don’t care too much about my name there, and I know my contribution is small, but I want the money to be in good hands. And I know they are doing good work for kids in disadvantaged economy condition.