Meta is bringing its AI chatbot to Threads in a way that should feel familiar to anyone who has spent time on X. According to Engadget , the company is testing a new feature that gives Meta AI a dedicated Threads account — @meta.ai — that users can tag in posts and replies to add additional context to the discussion. The premise is essentially the same as Grok on X, where tagging the bot to fact-check or contextualize a viral post has become its own genre of reply-guy behavior. The feature is currently in early beta and rolling out first to users in Malaysia, Saudi Arabia, Mexico, Argentina, and Singapore, per Engadget. Meta's own blog confirms the broader rollout ambitions, noting that @meta.ai mentions in Threads posts and replies are part of a wider push to bring its new Muse Spark model across WhatsApp, Instagram, Facebook, Messenger, and Threads — showing up in search bars, group chats, and posts.…