By Dan Weil Facebook is an ‘extraordinary business,’ he said. But Buffett sees the best businesses as the most difficult to value. Warren Buffett has shown admiration for Meta Platforms (Facebook) (FB) – Get Meta Platforms Inc. Class A Report over the years, but he also has indicated little interest in buying the stock. That comes from Markets Insider, which has published a round-up of the Berkshire Hathaway CEO’s remarks about Meta. Most recently, at Berkshire’s annual meeting, Buffett said, “We’ve always known that the dream business is the one that takes very little capital and grows a lot….