X launches Custom Timelines, a Grok-powered feature letting users pin any of over 75 topics to their home tab, in early access to Premium subscribers on iOS (Nikita Bier/@nikitabier)

X has introduced Custom Timelines, a Grok-powered feature that lets users pin any of more than 75 topics to their home tab. The tool is available in early access for Premium subscribers on iOS, marking the platform’s first rollout of custom timelines and enabling Grok to curate each user’s feed.

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