Large-scale giving is “much more difficult than it sounds,” the eBay founder Pierre Omidyar tells The Wall Street Journal.

Asked what advice he would give to other Silicon Valley billionaires moving into philanthropy, Mr. Omidyar said he would tell them “giving away lots of money is much more difficult than it sounds if you care about the impact this money is going to have.”

He added, “The second piece of advice I would give is that it’s really fun. … The approach I’ve taken has been just to try to demonstrate how interesting and fun philanthropy really is when you take the same entrepreneurial skills that made you successful in business and apply it to making the world a better place.”

Read about Pierre Omidyar’s giving in The Chronicle’s 2011 Philanthropy 50 report.