This is a set of slides from a conference presentation that treats a set of Reddit subreddits as epistemic communities, in this case, a set of them specific to Taylor Swift. To a large degree, sourcing matters to people who post (less so for people who comment) and while the usual media of record is relied upon, there are some surprises (such as one sub classifying the NY Times as no more credible than a gossip column). I wouldn't exactly consider Reddit a reliable source (though that varies widely by sub) but I do think studying the communities' epistemic practices is important and informative.
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