I've been using Google+ frequently and have taken to muting posts in which I am disinterested. I know Google+ uses machine learning algorithms to determine what content should be displayed to me. The problem is it takes time to select to mute a post and I haven't culled my circles enough to not get a fair amount of random content. There's no shortcut for muting posts so it's much easier to just scroll past the content. But if muting a post is information Google is using to determine what posts to feed to me then I'm all for training it. On the other hand, if Google is using other features, such as amount of time a post is active on my screen, then I'm hurting myself by taking the time to mute.
Basically, I know I'll get burnt out on G+ if I keep seeing junk, so I'd like to do it right so as not to abandon social networks for years again.