Jon Ronson wrote an entertaining book on the subject (https://books.google.co.uk/books/about/So_You_ve_Been_Public...).

It recounts several examples of internet self-righteous mobs lynching people for minor and larger offences.

In particular, one conclusion of the book is that aggressively not making amends for bad behaviour, even raising the bar for offensiveness, is the optimal survival strategy. See Trump ...