Recently anointed eBay CEO John Donahoe thumped his chest over the auction giant's first-quarter earnings. He praised a "diverse portfolio of businesses" as revenues jumped 24 percent to $2.19 billion and earnings rose 22 percent to $459.7 million. The problem: Younger businesses like Skype and PayPal aren't as profitable as eBay's core e-commerce business, which is why profit margins dropped. [WSJ]