Threads, Meta's app, is testing direct messaging within the app in a limited test in Hong Kong, Thailand, and Argentina.Previously, users had to switch between Threads and Instagram for direct messaging.The introduction of direct messaging on Threads is a response to users' requests for a native DM feature within the app.Mark Zuckerberg mentioned Threads is expected to be Meta's next major social app, with over 350 million monthly active users as of April.