[cptn_brittish]

The last time I had Facebook emails before I marked Facebook as spam every action which somehow concerned me on Facebook resulted in me getting a email and consequently flooding my inbox. Admittantly this was a few years ago when I finaly had enough of it so they might of gotten better but at one point they did.

[thaumasiotes]

Yes, I picked facebook as an example specifically because of their reputation for emailing you about everything. But I think you'll find that they tend to email you when other people do something that, in some sense, concerns you, not when you do something. (Remember the ancestor comment defining "solicited email" as email that responds to an action you take.) "This person just liked your comment" emails are plausible. "You just liked this person's comment" emails are self-evidently absurd, but they fall perfectly within the (spurious) definition of "solicited" that nitrogen wants us to believe in.