<rant>
Just the other day, I was googling for something in the library. I can't see so well, so I crank up the text size. It's quite readable to others sitting a few feet behind me.
On a whim, a stranger walks up behind me, addresses me by name, and tries to strike up a conversation. He wanted to know where the bathroom was or whatever, but he addressed me by name. I never saw him before.
"Wait wait wait. How'd you know my name?" I ask. "Who are you?"
"Oh, don't you see? It's right there in the corner of your browser window."
I looked, and sure enough, if you're signed in to Google Plus, Google will grace all of its web pages -- all of them, including gmail, search results, etc -- with your first and last name, as decided by your profile's display name. It's right there in the corner.
Since then, I learned my lesson: stay signed out of Google + when I'm browsing in pulbic places unless I want strangers to walk up to me and know who I am.
Sometimes I prefer to remain anonymous. Sometimes I feel like the increasing pressure to always use real names for services isn't a good thing, especially when those companies turn around and expose that valuable information in odd ways like Google is doing.
The option to exercise anonymity is one of the best defenses I have against these kinds of events.
That or I can simply stay signed out all the time...which is equivalent to not using the service.