One of the interesting features of Google+ is the Explore button. Clicking it reveals "What's hot and recommended" on Google+ (it used to be called "Hot on Google"). These are the posts that are trending, and in fact, to the right of your stream you will see a list of the Google+ hashtags and conversations that are literally trending. You can check out this feed any time you want, and control how many of these items get into your Home stream.
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