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I would advocate it's a good thing that we have closed social platforms. Most of the content they generate does not leak to search engines and that's a good thing, because most of it is trivialities. Imagine a researcher looking for medical information having to filter through all kinds of anecdotal nonsense to find true scientific studies. It's like browsing youtube and expecting to randomly bump on gems. IMHO, most social stuff is of little value. People still publish in traditional platforms the important bits [with the exception of closed scientific journals; but that's a different issue].