I have 'Jaana' circle where I save useful posts. I'm the only one in that circle.
Then I have an 'Evernote' circle through which I can send posts to Evernote by email.

Still I also save many posts to my external memory where I have created a file 'Google+ posts'. I have to name them always but it also helps to sort them out later, when you choose the name for a post yourself.
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