No, I will second him on that.
(Usenet is mostly dead and was before my time, so I will not comment on that.)
IRC is usually chill and enjoyable because you have people of the same interests who possess an ounce of technical knowledge in the same space.
Forums usually devolve into repetitive dystopias because of those in power (though there are plenty of antitheses), but the former qualifications usually play in, to a smaller extent, and the semblance of discussion can be maintained.
Imageboards tend to act like IRCs when they are small and you can get the feel for the regulars. However, even when they lose coherency on sites such as 4chan, the sheer transience and abrasiveness (ideally) of the culture is enough to keep the general public and the uninformed from making too much of an impact to drive away the current posters. In this chaos, some semblance of discussion is maintained, though the transience of that discussion is at the flip of a coin, and comment-less content-dumping is a real issue.
Sites like Reddit, ycombinator, etc. force the best and most socially agreeable comments to the top, while leaving those of less universally agreeable nature or singularity to be unseen. Its the Republic of comments, where people represent their opinions by upvoting others. You get insightful information (ideally), but at the cost of any real discussion. Its a pretty fair method for filtering through the content of the web for content aggregation, assuming you trust the tastes of the general population.
Facebook is communication between known friends with your entire social circle peeping at the edge. It is no better than talking in a real social setting except for convenience and content aggregation.
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