SAN FRANCISCO/BENGALURU (Reuters) – Facebook Inc (FB.O) Chief Executive Officer Mark Zuckerberg and his wife said on Tuesday they will give away 99 percent of their Facebook shares, currently worth about $45 billion, to a new charity in a letter addressed to their daughter, Max, who was born last week. The plan mirrors a move by other high-profile billionaires like Warren Buffett and Bill and Melinda Gates, who have pledged and set up foundations to give away their fortunes to charity.