I believe just an exception for plus.google.com needs to be added, as subdomains are shown for some URLs (for example, I see that the subdomains on tumblr are shown).
Better yet, fetch the page in the background, get the microformat info[1] which will contain link to author’s vcard[2] and show something like this instead:
[Pierre Far]
Google+ is just a platform — who cares for “plus.google.com” if it’s not about Google+.
