"Communities had a great vision, but they were used by less than 0.4% of users - yet contributed to 80% of spam reports, financial scams, and malware on X."
"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."
Nikita Bier described the custom timelines feature as 'one of the biggest changes to X' and a 'huge undertaking' that required 'many months' of development.