Feel like G+ is missing the 'Send a Message' feature? I did, too. Then I realized, that's the same as sharing a post with only one person. When you share with people by name, they receive an email alerting them to the post. (Unlike when you share with a circle.) The post still appears in your stream, which takes some getting used to. Once I did, I appreciated not having to switch to a separate Messages page with completely different UI to manage communications with particular people.
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