Today I realized that I cannot expect people on the Internet to have heard of the Geek Social Fallacies any more.
The Geek Social Fallacies are five things that geeks often believe about How Socializing Should Work, that cause a lot of conflict. I've found them to be pretty useful as a way to put a handle on certain concepts, and maybe even avoid going into bad situations.
http://plausiblydeniable.com/opinion/gsf.html
(Looking at them in 2017, I find myself wondering how many of the GSFs the design of most social networks is running straight into...)