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Facebook and Twitter happened.
When the fandom was contained on forums, mods kept them in check.
When it spread to 4chan, sage and insults kept them in check.
When it moved to reddit, downvotes kept them in check.
On Twitter and Facebook, there's no way to keep their sperging under control. There's no IP ban or spotting the samefag. If they're blocked they can make new account and keep shitting up the tubes all over again.