Retail investors have found a new meme stock.Opendoor Technologies (OPEN 0.70%) runs one of the biggest real estate direct buying operations in the U.S., which involves purchasing homes from willing sellers and attempting to flip them for a profit. This business model works great when the housing market is strong, but elevated interest rates have made the last few years extremely difficult for the company.Nevertheless, retail investors have used social media platforms like X (formerly Twitter) and Reddit to ...