This page is about writing down what is happening to you: what was said, when, and who else was there to see it. Unlike most of what is on this site, the idea below does not trace back to folklore or a mental health blog. It comes from a specific piece of legal guidance, and that fact cuts both ways. It makes the practice more solid where it applies, and it means being careful about where it does not.
Where this comes from
The guidance is the Crown Prosecution Service's legal guidance on stalking and harassment, written for prosecutors in England and Wales handling conduct that meets the threshold for those offences. It was not written for sealioning, gaslighting, concern trolling, or being dogpiled — the tactics this site mostly covers.
If your situation looks like that guidance rather than like this site — someone following you, contacting you against your wishes, or you're frightened of what happens next — this is the wrong page. Go to stalking instead; the record-keeping idea below is there too, sitting inside a plan that does far more than this page does.
Two more limits are worth stating outright rather than leaving implied. The guidance addresses conduct serious enough to reach a criminal threshold, not the everyday unpleasantness the rest of this site is about. And it describes one jurisdiction: England and Wales. Australia, New Zealand and the United States each run their own systems, and nothing on this page tells you what applies where you are.
What the guidance actually says
Read plainly, without upgrading its own hedge: it says it is sometimes helpful for victims to be encouraged to keep a record or diary of events. [1] Not that everyone should, not that it always helps — sometimes helpful, for some people.
It also has a view on format. Ideally the record is kept in a bound book, kept separately from personal details such as appointment times and other everyday entries. [2] That is worth reading exactly, because it is easy to read backwards. "Separately from personal details" means don't bury this inside an ordinary diary of appointments and errands — keep a dedicated book for it. It does not mean anonymise the record or leave out who was involved. The names, the platform, the exact words used: that is the record. A version with the details stripped out is not what the guidance is describing.
It should be completed as soon as possible after each event, with every entry timed and dated. [3] The guidance also allows the record to be kept electronically on a computer rather than on paper. [4] One method it offers for timestamping an electronic version is emailing each entry to your own address as you write it. [5] And it suggests noting the details of anyone who witnessed or heard what happened. [6]
That is the entire sourced content of this page. Six points, one source, one jurisdiction, written for a different situation than most readers here are in.
Why it might still be worth doing for the ordinary stuff
Nobody has told us this works for sealioning, or gaslighting, or being dogpiled by a dozen accounts that arrived within the same hour. No authority has studied it for that. What follows from here is this site's own reasoning, not a sourced claim, and it should read that way.
There is one concrete reason to think a personal record can matter for exactly those tactics, and it is not a guess about persuasion — it is about what else exists afterwards. This site measured how well two ordinary content filters caught the tactics it documents, and most of what was tested went through unflagged; see what the filters caught, and what they missed. If the systems built to notice this kind of thing mostly do not, the account you wrote down at the time may be the only version of events that ends up existing anywhere. That is a modest claim. It is also, on its own, a reason.
What it costs you
None of that is a reason to take up the practice without noticing what it costs. Keeping a detailed, contemporaneous record of low-level unpleasantness means reading it again, on purpose, sometimes for weeks. For one frightening incident, writing it down once is straightforward. For sustained sealioning or a pile-on that drags on, sitting with each entry as you add it can keep the whole thing alive in your head in a way that simply scrolling past it would not have. Documenting something and rehearsing it are not the same activity, and the difference is not always obvious from the inside while you're doing it.
A record also does not, by itself, do anything. Writing something down does not oblige anyone to read it or act on it, and it does not remove a post, close an account, or stop someone who was never going to stop anyway. What it does is make sure a fact does not depend only on your memory of it under pressure. That is genuinely useful. It is also the entire promise — anything sold to you as more than that is being oversold.
If you notice you can't stop checking it, or that writing things down is making the situation feel larger rather than more manageable, that is worth paying attention to in its own right. Setting the record aside for a while is not a failure of the method.
This sits alongside the site's other advice rather than instead of it. A record does not require you to reply, and it works whether you're using grey rock or declining to respond at all in the meantime. It is simply a way of making sure that, whatever you decide to do in the moment, an accurate account of what happened still exists once the moment has passed.