A meme was posted to c/memes@lemmy.world with a partial picture of a driver's licence. The Lemmy users in the comments proceeded to post all the identifying information they could get from the license, including gender, date of birth, and zip code of the person's home. The meme is probably reposted and so this isn't doxxing the Lemmy OP, but that's what the users in the comments seem to think they're doing.
Collecting and disseminating someone's personal information is doxxing even if that information could be found anyway with enough time and knowledge.
No, hydrofluoric.