Facebook tests multiple, topic-based feeds on its mobile app in place of one main News Feed, also tests wider rollout of Marketplace feature with its own tab
Sean O'Kane / The Verge :
Context & Ripple Effects
This 2015 test is the earliest move in a long arc of Facebook restructuring the single algorithmic News Feed into segmented surfaces. The company kept returning to the idea: it added a second Explore Feed of unfollowed sources in 2017, internally tested a tabbed feed with Most Relevant, Most Recent, and Already Seen views in 2020, and by 2021 was letting US users tap topics under posts to explore related business content.
The Marketplace half of the story matters commercially rather than experimentally: giving the feature its own tab carved out a dedicated commerce surface that Facebook later began monetizing directly with Marketplace ads promoted through the News Feed.
First-order effects
- Mobile users in the test see their one main feed replaced by multiple topic-based feeds, changing where posts surface and how often any single post gets seen.
- Marketplace gains a permanent tab-level entry point in the app, putting secondhand-commerce listings on equal navigational footing with the core feed.
Second-order effects
- Publishers and page operators lose guaranteed access to a single unified distribution channel, forcing them to optimize for whichever topical feeds Facebook surfaces next.
- A dedicated Marketplace tab builds the inventory and user habit that ad products like feed-promoted listings can later attach to, extending Facebook's ad reach beyond social content into commerce.
Third-order effects
- If the testing cadence holds, the single ranked feed gives way to a portfolio of intent-specific surfaces — relevance, recency, topics, commerce — with Facebook deciding allocation between them rather than users or publishers.
- Perpetual small-batch feed experiments become the operating model itself, making feed structure permanently unstable for anyone whose reach depends on it.
The trend: Facebook is steadily dismantling the one-size-fits-all News Feed into specialized, separately monetizable surfaces — a fragmentation that has continued from this 2015 test through Explore, tabbed feeds, and topic taps.