Shares of Nextdoor are experiencing some action after a hedge fund manager called it a hidden artificial intelligence (AI) opportunity.When it comes to notable investors, names like Warren Buffett, Bill Ackman, and Stanley Druckenmiller often surface first. And when it comes to artificial intelligence (AI) stocks, companies such as Alphabet, Amazon, or Meta Platforms are usually top-of-mind for investors. Perhaps unsurprisingly, Buffett, Ackman, and Druckenmiller all hold positions of some combination in th ...