Algorithm & Reach

Recency

Also known as: Freshness signal, Time decay

3 min read·Updated 2026-05-06

Quick definition

Recency is an algorithmic signal that weights newer posts higher than older ones in feed ranking. Modern social platforms decay older content rapidly — most posts have 80% of their lifetime reach within the first 24 hours after publishing.

What is recency?

Recency is the time-since-publication signal that algorithms use to weight content in feed ranking. All else equal, newer posts rank higher than older ones. The decay curve varies by platform but is universally steep on modern platforms — Twitter/X tweets typically have 90% of their lifetime engagement within 24 hours; Instagram Feed posts within 48 hours; Reels and TikToks can have longer tails (1-7 days) but most reach still concentrates early.

Recency interacts with other signals (engagement velocity, content type, viewer relationship) but it's an independent factor. A 3-day-old post with strong total engagement will rank below a 1-hour-old post with similar engagement-per-time, because the algorithm interprets recency as 'current' and 'still relevant'.

Why recency matters in 2026

Pre-algorithmic feeds were strictly chronological — newest first, regardless of engagement. Algorithmic feeds re-introduced relevance ranking but kept recency as a primary input because users want feeds that feel 'live' rather than archival. The result: posting consistency matters because each post earns reach in a tight window. Skipping a week of posting means missing those windows entirely; a re-post of the same content next week doesn't recover what was lost.

For creators, this drives the cadence question. 3-5 posts per week per platform feeds the recency signal continuously. Less than that, the algorithm gets cold on your account; more than that, you saturate your audience without proportional reach gains.

Frequently asked questions

How fast do posts decay?+

Most modern platforms: 80% of lifetime reach in first 24 hours, 95% within 72 hours. Reels and YouTube Shorts have longer tails (some posts continue earning reach weeks later) because the FYP-style discovery layer keeps surfacing past content.

Can I extend a post's lifespan?+

Modestly. Engaging back to early comments, sharing to Stories, cross-posting to other platforms with delay — all extend lifespan slightly. The structural decay is built into the algorithm; you can't reverse it.

Should I delete old posts?+

Generally no. Deleting hurts the algorithm's view of your account. Old posts that aren't currently driving reach also aren't actively hurting you; let them sit. Republishing as new format (carousel → Reel → thread) is cleaner than deleting and reposting.