Google+ has this nifty slider to choose how many posts go into the main stream.
How does Google+ determine which posts should be displayed?
How does Google+ determine which posts to display
google-plus
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This has been fixed recently. Go to your Circles, right click on the circle you want to throttle or mute, and select "Show stream from this circle". At the top of the stream you will notice a slider that lets you adjust how much you want to see from that stream, including all and nothing.
Google+ uses the following decision process to determine whether a user has access to your posts and where that post will appear in their stream.
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Best Answer
I don't think Google will let us know :) I'd guess they look for more popular ones or ones about topics you seem to care about.
Google is only starting/experimenting with the selection of interesting posts for their users. Facebook is far ahead with that. But I think Google is working on that every day and that they roll out slight advancements quite often. We will probably never know how they do it, as Facebook doesn't release that information either. Competition would benefit too much from this information. Google f.e. acquired some (I remember at least one) startups that focus specifically on finding user's interests and linking posts to that interests.