There is a difference between “collected data” by a website and “voluntarily provided data” by a user such as in a conversation’s posts/replies. Simply deleting every post a user ever made would render each topic incoherent - like ripping random pages out of a novel. A user’s account can be anonymized so discussions remain flowing and coherent, and the user’s identifying data (real name, email address, account activity, etc.) can then be deleted.
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