You can share directly with one user on G+, either privately (just make them the only person you share with) or publicly (share with them, plus the "public" cir

You can share directly with one user on G+, either privately (just make them the only person you share with) or publicly (share with them, plus the "public" circle.) Either way, they'll receive a notification message that you've shared something with them, and it will also show up in their stream. It's a lot easier than, say, Twitter DMs, where they're a totally out-of-band message.