(Bloomberg) -- TikTok reported that more than 500,000 merchants were selling to US users on its app at the end of 2023, more than double the number from three months earlier, as the video service stepped up its e-commerce effort.Most Read from BloombergTesla Axes Supercharger Team in Blow to Broader EV MarketNYC Police Break Up Columbia Protest and Clashes Erupt at UCLALilly Soars as Forecast Boost Shows Weight-Loss Drugs’ PowerPot Stocks Surge on Report DEA Set to Reclassify MarijuanaAmazon Pos