X has added the ability to sort your feed into multiple topic feeds, if you're still on the platform . And yes, it sounds exactly like TweetDeck (RIP). Announced Wednesday, the Elon Musk -owned platform now lets users build "Custom Timelines," that collate up to 75 feeds on the home tab. In an X post , Nikita Bier, the company's head of product, revealed the Grok -powered feature, which is available in early access to those paying $8 per month ($84 per year) for X Premium, and only on iOS (Android promised "soon"). Mashable Light Speed "It's powered by Grok's understanding of every post with the algorithm's personalization — meaning every timeline is made just for you," wrote Bier. "And it works even better when it's a topic you already engage with." This Tweet is currently unavailable. It might be loading or has been removed. If you're a TweetDeck mourner, this might sting.…