I made some suggestions long ago in Proposed EU law: right to be forgotten. GDPR is wider in scope than the proposal then, but I would expect the response needed to be roughly the same. GDPR covers mostly personally identifiable information and restricts the keeping and usage of it. If it has been released freely by the data subject, for example by using a real name like davies rather than a userid like BrowserUK, my understanding is that the data subject has the right to withdraw consent, but that, until then, all is well.
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