X Gets A Grok-Powered 'Custom Timelines' Feature, And A Way To Snooze Unwanted Topics

X, formerly known as Twitter, has just released what it calls "one of our biggest changes" yet.

Announced by Nikita Bier, head of product at X, the feature taps into a growing anxiety about how quickly the internet is shifting from something messy but human into something increasingly synthetic. In them, he essentially argues that we are approaching a tipping point where large parts of online communication, once assumed to be organic, will be dominated by automation, AI agents, and spam at a scale that breaks trust entirely.

That idea isn’t coming out of nowhere.

Bier has been vocal about the mechanics behind engagement systems, and how easily they can be gamed.

In broader interviews and discussions, he's warned that spam and automated content could become so overwhelming that traditional channels like calls, messages, and even social feeds may become "unusable" in any meaningful sense if left unchecked .

And now, X has now been updated with what feels like a continuation of that thinking, but framed less as a product problem and more as a cultural one.

First off, X has introduced 'Custom Timelines,' a feature that lets users pin dedicated topic feeds directly to the home screen alongside the existing For You and Following tabs.

The feature supports more than 75 predefined topics ranging from broad categories like technology and sports to more specialized ones such as cryptocurrency or design. Users select a topic, and the system generates a personalized timeline based on Grok's analysis of content across the platform, layered with X's standard algorithmic recommendations.

The result is a feed that adapts to individual preferences and improves over time, particularly for topics where a user has already shown engagement through likes, replies, or follows.

The rollout began with early access for Premium subscribers on iOS, with Android availability expected shortly afterward.

To create a timeline, eligible users tap a plus icon in the home tab bar and choose from the available list. Once pinned, the new tab appears as a swipeable option, allowing quick switching between general feeds and niche ones without altering the main experience.

This setup builds on earlier experiments with topic-based filtering on the For You tab, which had allowed temporary swaps but lacked the permanence of a dedicated tab.

Accompanying the launch was a related tool for snoozing topics on the main For You feed.

Also limited to Premium users and rolling out initially on iOS and the web, it enables temporary suppression of selected subjects for a 24-hour period.

The intent appears to be flexibility in managing content volume of what some users describe as reducing "slop" or overexposure to certain discussions, but without requiring permanent muting or algorithmic overhauls. Unlike the custom timelines, snooze resets automatically, preserving the dynamic nature of the primary recommendation engine.

In that context, the two features feel less like hot takes but more like early signals of a broader transition. Not necessarily a sudden collapse, but a gradual move toward an internet where verification, trust, and identity become central problems rather than background assumptions.

User reactions on the platform highlighted both enthusiasm and requests for expansion.

Some appreciated the ability to isolate interests like real estate or AI without mixing them into broader scrolling, while others noted gaps in the topic list, such as manufacturing, specific countries, or emerging niches, and suggested future additions like religions or custom combinations.

A few pointed out the iOS-first rollout as a recurring pattern for Android users, and several questioned the 24-hour limit on snoozing, preferring options for longer or indefinite pauses. Overall, the updates reflect ongoing efforts by X to refine how content is organized and surfaced, giving subscribers incremental control amid the platform's vast, algorithm-driven flow of posts.