My issue with Google and FB (as I imagine @ragingloli ) is how they collect data and then use it to target ads to you. I didn’t really care as I actually don’t mind targeted ads (I’d rather have ads for things that I am interested in than otherwise), but after the last election the dark side of data sharing really came out.
I ONLY used G+ for astronomy outreach and when the Virtual Star Parties finally died for various reasons I stopped using it.