I think rec.games.go was the centre of English-language Go discussion before the founding of Sensei’s Library in 2000, and it retained some prominence until GoDiscussions was made in the mid-2000s, apparently as a reaction to all the shitposting on r.g.g.
GoDiscussions metamorphised into Life in 19x19 in 2010.
In the one year of [Sensei’s Library’s] existence, I have known of only one “attack” which was immediately deflected … This is truly amazingly little. Perhaps it indicates SL is not widely used at all, or maybe it just goes to show that the good spirit that reigns here is contagious. Contrary to most newsgroups I know (well, I know two) there have been no violent arguments, nor endless threads which pile emotional reaction on emotional reaction.
Why there never can be a flame war on SL: it takes an hour to write a good lengthy flame, but unlike in a newsgroup everyone can delete this flame in approx. 10 secs.