I don’t have one of those computer spies. But meh on FB. Might as well stay off the internet completely. Just limit the info you share.
I've never been on FB, but know people that are on it a lot and foolishly get, or used to get, a lot of their "news and information" from it and they were of course VERY badly informed.
The Alexa and Google Home advice is real serious as far as I'm concerned. Already there is software that allows someone to take control of your device and keep it recording and even take personal and financial information. That's fucked up and of course it'll get worse.
I'm certain that we will hear about the FBI/CIA using it as a sort of wiretap to listen in if a criminal has one. So it could have some positive uses.
Overall though I wouldn't have one unless it became essentially hack-proof, my girlie girl has one but I wish she would get rid of it. Her kids love it though so it'll stay.