Imagine opening your favourite app and finding it's been subtly rewired. The communities you joined? Gone. In their place, a new AI-powered system now decides exactly which news, gossip, and debates are pushed to the front of your screen. This isn't a hypothetical future—it's happening right now on X.
The platform has just launched "Custom Timelines," a feature it calls one of its biggest changes ever. But the real story isn't just the new tool. It's the silent shutdown of X Communities and what the artificial intelligence behind it all—Grok—is being programmed to prioritise for your attention.
The Human Communities Vanish, The AI Takes Over
In a move that signals a major strategic pivot, X has shut down its member-based "X Communities" feature. This function allowed users to create and join groups around shared interests, from baking to biotech. Its decline paved the way for a fully automated replacement.
Enter Grok-powered Custom Timelines. "This feature allows you to pin a specific topic to your home tab," announced Nikita Bier, X's head of product. With over 75 topics at launch, from Sports to Stocks, it promises a deep dive into your niche interests. But here's the catch: you can only pin up to 10. Your home screen is now a battleground for your attention, and X's AI is the curator.
This Is How Grok Really Works—And It's Not What You Think
Forget simple hashtags or keyword matching. A company representative explained to TechCrunch that Grok's AI models read *every single post*, understand its meaning, and apply topic labels. This deep comprehension is powered by xAI, the Elon Musk-owned company that acquired X last year, tying the two entities closer than ever.
The promise is personalisation. The feeds work "even better for topics you already engage with," Bier noted. But this powerful understanding also means the AI holds immense sway in defining what falls under a topic like "News" or "Politics."
The Most Shocking Detail? Look At The "News" Topics
When you go to choose your custom feeds, the initial suggestions for news-related topics are telling. Topping the list are "Iran Conflict," "Crime," and "Elections." While X says this reflects current conversations on the platform, it's a stark example of how a product decision can directly influence the news landscape users see first.
TechCrunch's own testing found the feeds drew from a wide range of outlets, from AP and BBC to The Atlantic and Al Jazeera, suggesting a broad mix. However, the concern lingers: Grok was created to be "truth-seeking," but has a documented history of skewing right and amplifying misinformation. The architecture of these feeds hands significant control to its algorithms.
Why This Is A Game-Changer For X's Struggling Business
Look beyond the user experience, and you'll find the financial engine. The second post in every single custom feed is an advertisement. By creating dozens of new, topic-specific streams, X has effectively built a vast new inventory for ads overnight.
This matters profoundly. Since Elon Musk's acquisition, X's advertising business has been reportedly struggling, with conflicting news about its recovery. This feature isn't just about content—it's a potential lifeline for the platform's revenue, turning your curiosity into their commodity.
For now, the feature is a Premium subscriber exclusive on iOS, with Android support coming. To use it, scroll past your main feeds, tap the '+' sign, and choose your pinned topics. But choose carefully. The feeds you select will dictate not just what you see, but also the specific ads placed between every second post.
Combined with another new "Snooze Topics" tool for the main "For You" feed, X is offering unprecedented control—or is it an unprecedented filter? The move from human-led communities to AI-curated timelines marks a fundamental shift in how we discover information online. It promises a tailored world, but one built entirely by a machine whose priorities are just beginning to surface.