I ping people to some threads I post but very specific threads. There are 117 people on the list and every single one of them asked to be on it.
Each time I ping them I add:
“If anyone wants on or off this ping list, please let me know.”
I’m on several involuntary ping lists, just out of curiosity. One guy started spamming my FReepmail with totally unrelated, outside links, so I ditched that one. Another started getting testy that I wasn’t posting to the pinged thread, so I ditched that one, too. That leaves two involuntary ones.