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Funny. Now that you mention it, in the old days of IRC, fansubs did almost the same thing, if not longer than ADV, explaining jokes, terminology or whatever for anyone who didn't understand what was going on. Unlike ADV, they stopped after a few episodes of whatever they subbed and included them in footnotes on some sites sprawled across the interbutts of live journal or blogspot whatever. As obnoxious as some fansub sites were that sperged hard, they did far better when it came to not filling a whole damn screen with walls of text. They beat ADV there in that department. ADV tried at the very least. There was a joke back in the day spergy fansub sites grouped together and told ADV to release their pop up style subs as a way to not tread on their turf when it came to quality subbing. Pretty funny when anyone thinks about it.