Every post you publish is a decaying asset. It earns most of its attention in an initial window, then fades on a curve the platform's architecture determines. Borrow the language of half-life: the time it takes a post to collect half the attention it will ever get. You don't need precise figures — platforms don't publish them and they shift constantly — to see that the shape of the curve is the most underrated variable in content strategy.
Architecture sets the lifespan
How long content circulates follows directly from how it gets discovered:
- Chronological and velocity-driven feeds burn fastest. When distribution depends on recency and immediate engagement, a post's window is hours. It either catches fire now or never.
- Interest-graph feeds — LinkedIn among them — decay over days rather than hours. Distribution runs in waves: an initial test audience, then wider circulation if the signals are good, then a long tail as comments resurface the post into new feeds. This is why a LinkedIn post sometimes gets a second wind a week in: a well-connected commenter effectively re-publishes it to their network.
- Search-indexed content — YouTube videos, blog posts, anything Google can rank — barely decays at all by comparison. A tutorial that answers a durable question can collect views for years, because discovery is driven by queries that recur, not by a feed that moves on.
Same effort, radically different payback periods. A feed post is a flare; a search-indexed piece is an annuity.
The comment wave is the lever you control
On LinkedIn specifically, the practical consequence is that a post's lifespan is extendable. Each substantive comment does two things: it signals ongoing interest to the ranking system, and it exposes the post to the commenter's network. A post that keeps generating conversation keeps circulating; a post that collects silent likes dies on schedule. This is the mechanical reason discussion-provoking posts outperform announcement-style posts over their full life, even when day-one numbers look similar — one format has a longer half-life built into it.
What decay curves imply for cadence
Run the thought experiment. Suppose your typical post effectively stops circulating after four days. Posting weekly means your audience's feeds are empty of you roughly three days out of seven — not because you failed, but because your content expired. Posting twice a week closes the gap almost entirely. Now suppose you're publishing search-indexed essays with a lifespan of months: cadence barely matters, and quality per piece dominates completely, because each piece keeps working while you rest.
That's the general rule: the shorter your content's half-life, the more your results depend on cadence; the longer the half-life, the more they depend on per-piece quality. Most creators inherit a cadence from habit rather than deriving it from lifespan — treadmill posting on durable platforms, or leisurely posting on fast-decay ones, and wondering why the math never adds up.
Portfolio thinking
The half-life lens also reframes what your old content is worth:
- Feed posts are consumables. Their afterlife isn't circulation — it's your profile's recent-activity section, where new visitors sample you. Their residual value is conversion, not reach.
- Durable assets deserve disproportionate effort. An hour spent on a piece with a lifespan of months buys more total attention than an hour on a post that expires Thursday. If everything you make expires in days, you've built a treadmill with no savings account.
- Recycling is rational. Because feed content decays and audiences forget, reworking your best expired ideas isn't lazy — it's harvesting value the decay curve left on the table. The audience that sees the second version mostly never saw the first.
- Cross-posting converts lifespans. Turning a LinkedIn post that worked into a durable essay, or slicing a durable essay into feed posts, is trading along the decay curve — flare to annuity and back.
None of this requires knowing the exact numbers, which change and were never yours to know. It requires knowing the shape. Feeds forget fast; search remembers; conversation extends life. Build a portfolio that respects all three, and stop judging every piece of content on a one-day scoreboard when some of your assets are just getting started.