Perhaps of interest: the US Congressional Research Service, which is a
non-partisan research group within the Library of Congress, issued a short
report on the current state of defining and regulating online platforms:
https://crsreports.congress.gov/product/pdf/R/R47662
This is very US centric and focused on potential congressional legislation,
because the audience is meant to be US Congress members. But it could be a
nice primer/overview on current concerns.
cheers,
Phoebe
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