The Public Suffix List (publicsuffix.org) might be useful for this, although I doubt plus.google.com is listed in there (no same-origin security considerations). It's still the only systematic approach I know of that even remotely addresses the problem you're describing.
You're assuming he's using a device with a mouse. And why not add a simple feature that makes usability better on all platforms? Special case google plus here, just because this is such a common complaint. I've wanted it for a while, too.
I'm amazed that offering up a potential general solution that already exists, or suggesting someone measures their response before jumping at headlines, would result in downvotes here.
I think it's tone and missing the point. Starting a response with protip is a bit condescending, and the point isn't actually about not being able to use the UI to get the desired information, but about how the usability would be improved (for some users at least) by changing how information is presented.