Melinda Gates

Among today's top online stories for investors: Can you ethically invest in unethical companies? Should you invest in dividend stocks for the long term? And will Twitter raise another $200 million?

Among Thursday's best online stories for investors, Nouriel Roubini explains how to avoid a double-dip recession, Melinda Gates discusses philanthropy, and a great profile of super hedge fund AQR Capital Management.

Famed investor Warren Buffett announced that 40 billionaires have committed to donate at least 50% of their fortunes to charity as part of the Giving Pledge, a project that targets America's richest to pledge to donate their wealth.

Microsoft (MSFT) co-founder Paul Allen plans to give away most of his $13.5 billion fortune. In a statement, Allen said that his "philanthropic efforts will continue after my lifetime," The Wall Street Journal reported. Allen co-founded Microsoft with Bill Gates in 1975. He left the company in...

Bill Gates and Warren Buffet want American billionaires to contribute half of their wealth to charity. The two have been campaigning for the past year to encourage charitable giving. The Bill and Melinda Gates Foundation set up a pledge for people to donate money either through a lifetime or at the...