Are you tired of seeing random garbage from strangers in your G+ feed? Do you wonder WHY some stupid post from some stupid cartoon detective that you don't care about keeps popping up in your home stream?
You likely have your G+ settings set to show you "what's hot" in your home stream. You are free to turn that feature up, down, or...best yet...OFF
1. Across the top of your home stream, click EXPLORE
2. Then click "what's hot"
3. Click the settings button
4. De-select "show posts in home stream"
The default is for you to see a "standard" amount of random stuff from strangers in your home stream. You can turn that up, down, or off.
I turned it off a very long time ago, and I'm much happier.