Mark Zuckberg, the founder of Facebook, is one of the richest persons in the world. And already at the age of 26, he plans to make a major donation.Zuckberg, along with several other billionaires, has signed The Giving Pledge. Basically, he has signed and promised to donate 50 percent of his wealth. He plans to start donating a portion of his wealth immediately, and was even recently ranked 35th on the Forbes list of riches American people. Zuckberg created Facebook while as a computing student at Harvard. Facebook now has over 500 million people on it.