Facebook now takes into account how long you've viewed specific stories in News Feed in determining which posts to surface
News Feed FYI: Taking Into Account Time Spent on Stories — The goal of News Feed is to show you the content that matters to you.
Context & Ripple Effects
This lands two months after Facebook's April update, which shifted News Feed toward friends' status updates and explicitly warned post reach and referral traffic to publishers could decline. The new signal — how long you linger on each story — extends that same reweighting from what you clicked to what held your attention.
It also sets up the rest of 2015's ranking cadence: within weeks Facebook adds video-specific engagement signals like activating audio and full-screen viewing, and by July gives users direct feed-tuning controls. Dwell time turns out to be the template for a measurement-first approach to ranking.
First-order effects
- Publishers whose posts are opened and quickly abandoned see less distribution, while stories that hold readers get surfaced more — reach now depends on measured attention, not clicks or likes alone.
Second-order effects
- Content strategies shift toward formats that maximize on-screen duration, since Facebook has made watch time an explicit input; the April decline in publisher referrals compounds as low-dwell stories drop out.
Third-order effects
- Time spent hardens into News Feed's organizing metric, culminating in Facebook formally prioritizing it in 2016's time-spent ranking overhaul — and later forcing the company to explain itself with transparency tools like "Why am I seeing this post?" when opaque attention-based ranking draws scrutiny.
The trend: News Feed ranking is evolving from click- and like-based signals toward inferred attention metrics like dwell time, reshaping what publishers produce and forcing Facebook to add user-facing explanations as the system grows opaque.