[0] To prove prima facie defamation, a plaintiff must show four things: 1) a false statement purporting to be fact; 2) publication or communication of that statement to a third person; 3) fault amounting to at least negligence; and 4) damages, or some harm caused to the person or entity who is the subject of the statement.
Now what you need to do is show damages. Lost your job? Deplatformed or demonetized? Vendors, partners, or clients cut ties? Victim of harassment (online or otherwise)?
Keep in mind, making an accusation not totally supported by evidence is not defamation. In the US, it falls on the defamed to both prove that the accusation is false and prove that the accuser knew it was false. Not that they had doubts or uncertainty, but that they knowingly lied. Making an ultimately incorrect acusation based on incomplete evidence isn't legally negligent.
Essentially, it comes down to what a reasonable person would do.
A reasonable person would probably not invent claims without evidence. Let's take the Kyle Rittenhouse case as the example since it's so recent and visible. The Twitter mob openly calls this individual a murderer, white supremacist, and terrorist, among other things. They also invent and distribute "facts" which are material to the case such as where the individual got the AR-15 used during the event, and the circumstances surrounding its use. [1]Significant effort is undertaken to obfuscate the truth through the editing of video footage and censoring of contrary opinions.
> Elon musk called someone a "pedo guy" because he moved to Thailand, and was found to be fine because a reasonable person wouldn't take the statement seriously.
This is clearly not the case when dealing with situations like the above, and many others which lead to individuals being deplatformed, harassed, or physically threatened, or even attacked. There can be no doubt that claims of racism, sexism, homophobia, or other bigotry are taken seriously by all the major platforms and society as a whole. It is common knowledge that such claims cause harm.
A reasonable person would not make damaging claims without any supporting evidence, manufacture fake evidence, or aid in the distribution of either.
[0] https://www.law.cornell.edu/wex/negligence
[1] https://www.breitbart.com/tech/2020/09/02/facebook-declares-...
Furthermore, repeating a rumor is not negligent. So if I make a claim without evidence, but you repeat it and cite me, only I have done something wrong.
To get concrete, there is evidence that Kyle Rittenhouse murdered someone. He's been charged with first-degree intentional homicide, this is Wisconsin's equivalent of Murder.
There is evidence that Kyle Rittenhouse is a white supremacist. He travelled across state lines to disrupt and intimidate people at a protest for racial justice. While he may not be a card carrying neo-nazi, that's evidence.
There is evidence that Kyle Rittenhouse is a terrorist. He (presumably) unlawfully used violence and intimidation against civilians for political purposes. He's listed on wikipedia's list of right-wing terrorists in the US[0].
So now you have to show that not only are the above statements false, but that they are so blatantly false, that it is unreasonable for a person to believe them, and that to reach those conclusions would require negligence. But of course, you can't really do that. Wikipedia agreeing with me pretty much proves that my claims aren't unreasonable. They may be wrong, but they aren't negligently so.
> They also invent and distribute "facts" which are material to the case such as where the individual got the AR-15 used during the event, and the circumstances surrounding its use.
Coming to incorrect conclusions after good faith investigation isn't negligent. At the moment, as far as I know, Rittenhouse got his rifle within the state of Wisconsin, from a friend. But not knowing that information, it is not unreasonable and negligent to state "He must have acquired the gun illegally, since he is underage and can't transport it across state lines." That's a reasonable conclusion. It's wrong, yes, but it's reasonable.
> This is clearly not the case when dealing with situations like the above,
Just to be clear, you are saying that it is reasonable for a person to call someone else a pedophile without any evidence, but calling someone who shot and killed someone else, on video, a murderer, is negligent? Am I getting that right?
Previously I said that you misunderstand negligence. I'll repeat what I said and add that it appears that you, personally, have an extraordinary level of prudence. Which is totally acceptable, and perhaps even an admirable trait. But it is not ordinary. Legally speaking, you appear to be "unreasonable".
[0]: https://en.wikipedia.org/wiki/Right-wing_terrorism#United_St...