Lately my Google+ stream seems to consist almost entirely of comments people posted on YouTube videos.
I have absolutely no interest in seeing these. How can I hide/filter these posts?
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I'm not sure if you mean your own videos or other people's Youtube videos. Here's what I've found.
Go to https://plus.google.com/settings then scroll down to "Receive notifications" click on "Posts" and then unselect the last option "Shares or comments on your content across the web (for example, your YouTube videos or your blog)"
Also you may want to make sure when you comment on a Youtube video that the "Also share on Google+" option is off. Follow up comment are most likely considered responses and will show up on the stream (I'm not sure about that though).