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generic facebook grade warnings
Which probably puts it's on a par with the Home Office warnings, which are graded from "Attack imminent", to "Attack imminent, no we really mean it this time" to "Attack imminent, look over there, that was totally a terrorist attack" and "Attack imminent, what do you mean we didn't do anything about that attack that did actually just happen".
Is that one of those generic facebook grade warnings, 100% of which turn out to be utter mince while all actual terror attacks are usually completely unpredicted?