Social media app X rolled out a new custom timeline feature earlier this week, and so far, user reactions have been positive. The new feature is reminiscent of TweetDeck , the popular feature that recently rebranded as X Pro. Using the new custom timelines feature, X users will be able to create custom feeds for specific topics. The new feature, powered by the xAI tool Grok , is now available to Premium subscribers on iOS devices. Nikita Bier, head of product at X, announced the rollout in a post on X and said that Android support would be coming soon. "It's powered by Grok's understanding of every post with the algorithm's personalization — meaning every timeline is made just for you. And it works even better when it's a topic you already engage with. This was a huge undertaking across many months, so we're excited for you take it for a spin," Bier wrote. X also released a short video showing how the feature works. This Tweet is currently unavailable. It might be loading or has been removed.…