Eh, "obviously badly manipulated image posted on twitter" would be a good indicator of satire, if obviously untrue drivel posted on Twitter hadn't just taken over the world.
> "Crap! Robin Hood airport is closed. You've got a week and a bit to get your shit together otherwise I'm blowing the airport sky high!!" (for the benefit of my MI5 handler, that is a quotation not a threat)
UK equivalent: https://en.wikipedia.org/wiki/Twitter_joke_trial
> "Crap! Robin Hood airport is closed. You've got a week and a bit to get your shit together otherwise I'm blowing the airport sky high!!" (for the benefit of my MI5 handler, that is a quotation not a threat)