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I'd suggest being careful about your approach. If you lose this battle, you may not get another chance. David Gerard most likely has 100 times more experience with wiki battling than you. Essentially, when you make up a strategy, sleep on it, and then try imagining how a person already primed against LW would read your words.
For example, expect that any edit made by anyone associated with LW will be (1) traced back to their identity and LW account, and consequently (2) reverted, as a conflict of interest. And everyone will be like "ugh, these LW guys are trying to manipuate our website", so the next time they are not going to even listen to any of us.
Currently my best idea -- I didn't make any steps yet, just thinking -- is to post a reaction to the article's Talk page, without even touching the article. This would have two advantages: (1) No one can accuse me of being partial, because that's what I would openly disclose first, and because I would plainly say that as a person with a conflict of interest I shouldn't edit my article. Kinda establishing myself as the good guy who follows the Wikipedia rules. (2) A change in article could be simply reverted by David, but he is not allowed to remove my reaction from the talk page, unless I make a mistake and break some other rule. That means, even if I lose the battle, people editing the article in the future will be able to see my reaction. This is a meta move: the goal is not to change the article, but to convince the impartial Wikipedia editors that it should be changed. If I succeed to convince them, I don't have to do the edit myself; someone else will. On the other hand, if I fail to convince them, any edit would likely be reverted by David, and I have neither time nor will to play wiki wars.
What would be the content of the reaction? Let's start with the assumption that on Wikipedia no one gives a fuck about Less Wrong, rationality, AI, Eliezer, etc.; to most people this is just an annoying noise. By drawing their attention to the topic, you are annoying them even more. And they don't really care about who is right, only who is technically correct. That's the bad news. The good news is that they equally don't give a fuck about RationalWiki or David. What they do care about is Wikipedia, and following the rules of Wikipedia. Therefore the core of my reaction would be this: David Gerard has a conflict of interest about this topic; therefore he should not be allowed to edit it, and all his previous edits should be treated with suspicion. The rest is simply preparing my case, as well as I can, for the judge and the jury, who are definitely not Bayesians, and want to see "solid", not probabilistic arguments.
The argument for David's conflict of interest is threefold. (1) He is a representative (admin? not sure) of RationalWiki, which is some sense is LessWrong's direct competitor, so it's kinda like having a director of Pepsi Cola edit the article on Coca Cola, only at a million times smaller scale. How are these two websites competitors? They both target the same niche, which is approximately "a young intelligent educated pro-science atheist, who cares a lot about his self-image as 'rational'". They have "rational" in their name, we have it pretty much everywhere except in the name; we compete for being the online authorities on the same word. (2) He has a history of, uhm, trying to associate LW with things he does not like. He made (not sure about this? certainly contributed a lot) the RW article on Roko's Basilisk several years ago; LW complained about RW already in 2012. Note: It does not matter for this point whether RW or LW was actually right or wrong; I am just trying to establish that these two have a several years of mutual dislike. (3) This would be most difficult to prove, but I believe that most sensational information about LW was actually inspired by RW. I think most mentions of Roko's Basilisk could be traced back to their article. So what David is currently doing in Wikipedia is somewhat similar to citogenesis... he writes something on his website, media find it and include it in their sensationalist reports, then he "impartially" quotes the media for Wikipedia. On some level, yes, the incident happened (there was one comment, which was once deleted by Eliezer -- as if nothing similar ever happened on any online forum), but the whole reason for its "notability" is, well, David Gerard; without his hard work, no one would give a fuck.
So this is the core, and then there are some additional details. Such as, it is misleading to tell the readers what 1% of LW survey identify as, without even mentioning the remaining 99%. Clearly, "1% neoreactionaries" is supposed to give it a right-wing image, which adding "also, 4% communists, and 20% socialists" (I am just making the numbers up at the moment) would immediately disprove. And the general pattern of David's edits, for increasing the length of the parts talking about basilisk and neoreaction, and decreasing the lenght of everything else.
My thoughts so far. But I am quite a noob as far as wiki wars are concerned, so maybe there is an obvious flaw in this that I haven't noticed. Maybe it would be best if a group of people could cooperate in precise wording of the comment (probably at a bit more private place, so that parts of the debate couldn't be later quoted out of context).