U.S. Senator Elizabeth Warren wrote to Mark Zuckerberg, demanding more information from Meta regarding its latest stablecoin plans and criticizing the company's "concerning lack of transparency" in its related business. In the letter, Warren stated that given Meta's massive global user base, any stablecoin-related business could have a significant impact on market competition, user privacy, payment system integrity, and financial stability. Previously disclosed information indicates that Facebook has been testing stablecoin payment functionality for some creators in Colombia and the Philippines, based on USD Coin (USDC), requiring users to link third-party encrypted wallet addresses. A Meta spokesperson responded that the company "does not have a Meta stablecoin" and currently only hopes that users and merchants can use various payment methods, including third-party stablecoins, on the platform. It's worth noting that Meta launched its stablecoin project Libra (later renamed Diem) in 2019, but ultimately terminated it in 2022 due to regulatory pressure. Warren has long been one of the most vocal cryptocurrency critics in U.S. Congress and has repeatedly questioned Meta's stablecoin plans. (Fortune)