I find it disturbing that FB sees itself as the arbiter of which events and what people are in need of alerting.
Now I don't think they're doing it very well and the fact that it's subject to the typical feature creep is a problem, but then feature creep is a general problem in software.
Do you have a citation for this claim that 'FB is just answering the demand'?
>"It's not a simple problem to solve."
Who asked them to solve it?
I'm not obliged to provide citations for every personal observation I make in a short comment, or indeed in a long one. Try being less rude in future interactions.