-Google+

Does anybody know how to shut off and hopefully remove Google+? After basically doing nothing for several years it has suddenly decided to pollute my screen and notifications with crap from some comments I posted on youtube. I really don't care that 10 other people have commented on the same video I commented on six months ago. It seems it won't let itself be turned off or removed. I don't want it, I don't need it and I don't ever intend to use it.