In 2013, we saw how internet activists’ snap judgements about interpretation (or misinterpretation?) of jokes at pycon destroyed the professional career of two individuals (Source: A Dongle Joke That Spiraled Way Out Of Control).
The internet activism first sympathised with Adria Richards and then decided to side with the developer, eventually both of them (and SendGrid customers temporarily) took a major hit which could probably have been resolved offline and would have never become a part of permanent history.
As if this was not enough, this year the same story has been repeated with Gurubaksh Chahal and his girlfriend Juliet Kakish.
The claim goes that he allegedly hit his girlfriend 117 times and she allegedly suffered bruises and injuries, there is an alleged video of that proving the same (I haven’t been able to find one yet that does not imply it does not exist though) (Source: A Letter To The Board Members Of RadiumOne).