Wikipedia's article on internet forums describes a necropost as a message that revives an arbitrarily old thread, causing it to appear above newer and more active threads. [1] That is a weaker kind of source than a dictionary entry or a platform's own policy: it is usage recorded by volunteer editors rather than settled lexicography, and the section it comes from carries its own notice flagging it as needing expansion. This page treats it accordingly, as attested community usage rather than a professionally settled definition.
That definition is also broader than the tactic this page is about. On Wikipedia's wording, reviving an old thread counts as a necropost whether the reply is a genuinely helpful answer to a years-old question or a deliberate attempt to restart a fight — the definition only concerns a thread's age relative to newer ones, not why anyone brought it back. Narrowing that down to a settled argument, reopened on purpose, in front of people who had moved on, is this site's own distinction, not the encyclopaedia's, and the rest of this page should be read with that in mind.
What forums generally think of it
The same section goes on to say the practice is generally seen as a breach of netiquette on most forums. [2] That is a claim about manners, not about harm — it says communities tend to find it rude, which is a real but modest thing, and this page is not going to inflate it into anything closer to abuse. A great deal of what gets called necroposting is exactly this and nothing more: mildly poor form, not a hostile act.
What makes it a tactic, and what doesn't
Most reopened old threads are a public service. Someone finds a years-old technical question still ranking first in a search result and posts the fix that finally worked for them, and plenty of communities value that highly enough to have no rule against it at all. None of that is what this page is naming.
What is being named is specifically reviving a thread to restart an argument that had already been settled or abandoned, aimed at people who had stopped expecting it back. What matters is the subject and the intent — an old dispute, deliberately reopened — not simply how old the thread is. A ten-year-old how-to thread getting a good answer is not this. A ten-year-old argument thread getting the losing side's reply, years later, addressed to people who had long since stopped thinking about it, is closer to what the label is for.
Recognising it
- A reply arrives in a thread that has been inactive long enough that most original participants have moved on or left
- The reply reopens a disagreement rather than adding information, a fix, or a genuine update
- Little or nothing new is offered beyond restating a side that had already lost the argument, or never won it
- The timing looks chosen rather than accidental — an old grievance resurfacing with no new development to explain why now
Every one of these has an innocent reading too. New members find old threads constantly and have no way of knowing an argument reads as stale to everyone else; a genuinely new fact or source can legitimately reopen something that looked settled; and forums that do not lock old threads invite exactly this by design, on purpose, as part of how they work. None of it is proof on its own of restarting an argument deliberately.
The honest difficulty
Reviving old threads is mostly a good thing, and treating every late reply as suspect makes a place worse, not safer. Search engines route people to old threads constantly, and the most useful thing many of those people can do is add the answer that was still missing when the thread went quiet. Forums that lock threads specifically to prevent revival are trading that usefulness away for something else, and not every community wants to make that trade.
What separates an old reply worth having from this tactic is not the age of the thread — it is whether what gets added is new information or an old argument. That line is this site's own to draw. Wikipedia's definition talks only about a thread's age relative to newer ones and about the practice being generally seen as rude; it says nothing at all about arguments, settledness, or intent. Everything above about restarting a dispute is this site's reasoning about why the pattern matters, not something the source itself claims.
What to do
Don't re-litigate. Not answering declines the one thing reopening a settled dispute was built to produce: a fresh round of the same argument. No one has measured whether staying quiet actually stops someone doing this again; it is an argument from what the timing is for, not a tested result.
Answering the information is a different matter. If what actually brought the thread back is a genuinely new fact, source or update, that is not the tactic this page describes, and there is nothing wrong with engaging with it on the merits.
Treat repeated timing as the signal, not any one post. A single old thread getting a reply tells you very little. The same account or the same argument resurfacing again and again, each time aimed at people who had stopped discussing it, is the more genuine pattern — though even then, declining to answer costs you nothing.