That’s the obvious flaw in views and upvotes: they reward whatever’s already popular. Fresh content starves at the bottom of the feed, and the platform slowly turns into a rerun channel. Ranking a feed well is one of the quietly hard problems where I work, so I’ve spent a fair bit of time thinking about which other signals are worth trusting.

Watch what people do, not what they tap

#

Explicit feedback is scarce and biased; behaviour is plentiful. Time on page and scroll depth tell you whether someone actually read the thing or bailed after the first paragraph. Revisits are even better — coming back to a piece is a stronger endorsement than any upvote. And a fast exit is a useful negative signal: the content promised something the reader didn’t get.

Signals baked into the content itself

#

Good content doesn’t always collect early likes, but it usually shows its quality in other ways. Novelty is one — does the piece cover ground the platform hasn’t seen? Structure is another; clean formatting, decent grammar and clarity correlate with quality more than we’d like to admit. An author’s track record is a fair prior too, judged on how their past work held readers rather than on raw like counts. Early comments help as well: three genuinely positive comments beat thirty reflexive upvotes, and a bit of semantic analysis can flag content that fills a gap the platform has been missing.

Borrow signals from outside

#

The wider internet tells you what’s resonating right now. Content that lines up with trending search keywords has built-in relevance, and quick publishing on a rising topic deserves a boost. What’s buzzing on Twitter or Reddit is often a preview of what your own users will want next — with a little prediction you can promote matching fresh content before the wave instead of after it. Your own search box is underrated too: if users keep searching for a topic, or a piece pulls steady traffic in from search engines, that’s relevance you didn’t have to guess at.

Blending the signals into one score

#

Here’s the idea in a few lines of Python. It’s an illustration, not a production system. Each signal is normalised to a 0 to 1 range so that one with big raw numbers can’t drown the rest, a weighted sum turns them into a single score, and a time decay gives a new post a fair shot against last month’s hit.

WEIGHTS = {"read_depth": 0.3, "revisits": 0.25, "quality": 0.25, "early_comments": 0.2}
HALF_LIFE_HOURS = 48  # a post loses half its score every two days

def normalise(values):
    lo, hi = min(values), max(values)
    return [(v - lo) / (hi - lo) if hi > lo else 0.0 for v in values]

def rank(items):
    """items: dicts holding raw signal values plus "age_hours"."""
    norm = {name: normalise([item[name] for item in items]) for name in WEIGHTS}
    scores = []
    for i, item in enumerate(items):
        base = sum(weight * norm[name][i] for name, weight in WEIGHTS.items())
        scores.append(base * 0.5 ** (item["age_hours"] / HALF_LIFE_HOURS))
    order = sorted(range(len(items)), key=lambda i: scores[i], reverse=True)
    return [items[i] for i in order]

The weights are guesses until the tests below say otherwise. Views and likes can still go in; they just become one input among several instead of the whole score. The half-life decides how quickly old posts sink, which is a topic of its own: I went into it in how feed ranking algorithms decide when to bury old posts. Real systems usually learn the weights with a model rather than picking them by hand, but the shape is the same: many signals in, one number out, sort.

Then test it honestly

#

However clever the signals, A/B test them — show new content to a slice of users and compare its engagement against the incumbents. And watch how things spread: shares, mentions and embeds, on and off the platform, say more about value than a view counter ever will.

No single metric survives contact with reality. The rankings that actually work blend behaviour, intrinsic quality, timeliness and honest experiments, and no one signal gets the final word.

Content goes stale. People open the app wanting to know what’s new, and the feed has to deliver that. But a great post from last month shouldn’t vanish just because it’s no longer new. Decay functions are the standard way to model that trade-off, and they’re simpler than the name suggests.

Freshness matters, but not everywhere

#

Open a news site or a social feed and you’re usually after the latest thing. In fast-moving domains like news or financial markets, last week’s content is dead weight, so rankings there lean hard on recency.

Not every domain works like that, though. Academic writing and long-form journalism hold their value over time, sometimes even gain it. Age matters in most ranking systems, but how much weight it deserves depends entirely on what you’re ranking.

Modelling the fade with exponential decay

#

The usual way to model fading relevance is exponential decay: the older an item gets, the faster its perceived value drops. In its simplest form:

relevance = e^(-decay_rate × age)

where relevance is the current value of the content, the decay rate controls how quickly it loses that value, and age is usually measured in days since publication.

What I like about this model is that it’s one knob. Tune the decay rate and you decide whether content stays relevant for hours, days, or weeks. That’s the entire configuration surface.

Engagement keeps good content alive

#

Age is only half the picture. Views, likes and comments tell you whether people actually care, and a ranking that ignores them buries good work along with the bad. The simple fix is to multiply the two together:

score = engagement × e^(-decay_rate × age)

Now an older post with strong engagement can still outrank a mediocre new one. It just needs more and more engagement to hold its spot as the decay term shrinks underneath it.

In practice the lifecycle looks like this: a new post gets a freshness boost and a fair shot at being seen. If people view it, like it, comment on it, the score climbs. As days pass, decay eats into it, and only posts with sustained engagement stay near the top. Fresh content gets its chance; genuinely good content earns its stay.

That’s honestly the whole trick. One exponential, one engagement term, one knob to turn. The hard part is deciding what the decay rate should be for your particular content, and that part is all judgement.