The thing is, it's virtually impossible to do so. For example, if you're having a discussion about cars and you're a mechanic, you want to cite that as a basis for authority on the topic. In that instance, it could be a harmless non-inflammatory situation. However, down the road, you're having an unrelated discussion and someone gets butthurt and uses that plus other similar tidbits and can narrow things down. To completely remove all personal info from discussion would be to almost make any online interaction pointless and useless because every discussion would be so abstract it would lack substance and there would be no point. And, once again, I don't even have to explicitly state my personal info, just posting in the subs for my city and my interests can be enough to triangulate identity to the right person in the right situation.