There aren't ad hominem attacks between individual posters, but individual topics/subjects are attacked all the time. The most frequent one I've seen is either

There aren't ad hominem attacks between individual posters, but individual topics/subjects are attacked all the time. The most frequent one I've seen is either some political group or companies/employers. If you go off of HN comments, FB, Amazon, Google, Apple, etc. are all "evil" and terrible companies run by insidious people that want to steal your information, take all your money, and turn us all into mindless slaves.