I just had this dream/nightmare, so now I'm telling you so you can be scared.
I was one of the only Humans ever abducted and brought to live in alien society, mostly in space stations. I was getting along as a PI/thug for hire since Humans are more casually violent than aliens, who are mostly small and peaceful. Their infosystems are ridiculously open and simple, so I can just code around anything. I suspect Humans had been loose in the Galaxy before this cycle of civilization, because they already had a suspicious fear of our kind.
Then I hear about a ship full of Humans coming, so I bribe/threaten the dockmaster into giving me the passenger manifest. It's Mark Zuckerberg and a shitload of Facebookers. A few seconds of thought reveal how this is gonna go: Facebook infestation, spreads system to system, within a Galactic cycle everyone would be their slaves.
I get ready to take my ship to the other side of the Galaxy, figuring 100,000 years time and light-years should keep me safe (even in my dreams, I don't believe in bullshit like FTL travel). The station panics, having never seen anything that scares a Human. I get out to the edge of the system, see their ship on my radar. Moral quandry: Should I kill them all, and prove how violent Humans are, or let these predatory literal motherfuckers loose on defenseless little alien critters?
I woke up. What I'm saying is, if you meet a Facebooker, kill them before they get out into the Galaxy.