September 1, 2026
Bob Schulte
Your team has maybe ten Reddit comments a week in them. Spend those on fresh threads and you’re betting on odds. Spend them on old threads that already rank and you’re betting on volume. Most teams pick one lane and lose everything the other pays.
The metric that settles it is content half-life, the point where a thread has earned half of everything it will ever earn, upvotes, comments, impressions, and citation appearances. Plot those against hours since posting and read the 50 percent crossing.
Some threads hit that mark in a day. Others take years, which is what makes them evergreen content. Below I’ll show what our citation data says about thread age, what each lane costs you, and how to split your week between the two.
I studied 19,509 AI citations across 1,740 Reddit threads, and thread age turned out to be one of the strongest signals in the whole dataset. Two numbers frame the debate.
The odds collapse fast. Exponential decay governs the curve, so a thread’s citation fate is mostly decided in its first month:
But most citations come from old threads anyway. 48% come from threads under a year old, and 52% come from older ones, some as old as a decade. The reason is volume. If 10 new threads are posted today and 6 get cited, that’s a great hit rate. But if 10,000 old threads exist and even 1% get cited, that’s still 100 citations from old content.
Half-life is what connects those two facts. The curve runs from publication through a steep engagement velocity climb, then into decay, and half-life marks the accumulation midpoint on that curve. Neither of the other two metrics tells you that:
These numbers come from a larger study on which Reddit threads AI actually cites. For the full method and the other findings, read: The Anatomy of a Cited Reddit Thread.
Fresh threads are where the odds live, and that pulls most teams toward them by default. Here’s what you gain from working this lane, what it costs you to run, and which teams it actually fits.
Old threads look like a losing bet until you check where the citations actually come from. Here’s what this lane gives you, what it costs, and who should run it.
That last problem is the one worth solving first. VisibilityStack tracks which Reddit threads AI cites for your brand and category, so your old-thread list holds only threads that already earn citations instead of ones you hope might.
You’ve seen both cases. Here’s how I’d rule on each part of the decision.
The odds live in new threads and the volume lives in old ones, which means each lane holds something the other cannot give you. Run only the new-thread play and you’re capturing high-probability chances from a tiny pool. Run only the old-thread play and you’re working proven sources at long odds while every fresh opportunity ages out untouched.
A team that commits to one lane forfeits roughly half the citations available to it. The question was never which lane to pick, it’s how to divide a week between them.
Sorting threads by date feels logical and leads you wrong. A two-year-old thread that ranks on page one or already appears in AI answers beats a three-day-old thread nobody found, every time. The date tells you the odds, the position tells you the reality.
So build your list around whether a thread holds a search or citation position, then use age to decide how fast you need to move on it.
Between the two lanes sits the largest bucket of all, threads past the 30-day window that never earned a position and never will. This is where most Reddit effort quietly goes to die, because the threads look active enough to justify a reply and pay nothing back.
Cut that bucket entirely. Skipping it frees up most of your weekly budget for the two buckets that actually return something.
The right ratio depends on what you’re buying. Weight toward new threads when you need visibility now and can staff the daily monitoring. Weight toward old cited threads when you’re playing for presence in AI answers and want a list you can work through steadily.
Then rebalance monthly, since your target list refreshes and the threads that mattered in January often stop mattering by March.
Every verdict above assumes someone knows which threads currently rank, which ones AI cites, and which ones just got posted. None of that lives in anyone’s head.
So this decision creates a job. Someone has to maintain the thread inventory, review it weekly, add new threads as they surface, and drop the ones that stopped earning. It matters less whether that person is a CMO, a growth lead, or a community manager. What matters is that one person owns it, because you cannot run a split you cannot see.
Stop treating new versus old as a choice. Reply fast inside the 30-day window, add strong replies to old threads that already rank or get cited, and skip everything in between. That split is the whole strategy.
What makes it hard is the upkeep. Fresh threads age out while you’re still checking, and old cited threads change quietly as AI rotates its sources. VisibilityStack tracks which threads AI cites for your brand and category, flags new ones before the window closes, and keeps the inventory current so your team spends its ten weekly comments on the threads that actually pay.