Facebook's third employee, Dustin Moskovitz, is one of the youngest self-made billionaires to have signed the Giving Pledge.
"As a result of Facebook’s success, I’ve earned financial capital beyond my wildest expectations. Today, I view that reward not as personal wealth, but as a tool with which I hope to bring even more benefit to the world," he said in his letter.
Moskovitz and his partner, former Wall Street Journal reporter Cari Tuna, established Good Ventures as a philanthropic foundation to help distribute his wealth. Moskovitz is also now founder and CEO of Asana, a collaboration software company.