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G+ have (finally) fixed this so that your tagline shows everywhere as opposed to just in some places when hovering over your profile
Oh hey, we launched a minor feature yesterday that makes me happy: if you fill in the "Tagline" field on your profile, it now shows up on your hovercard. So that's a great place to put a few short words about yourself; it's the first thing most people will see about you, after your name and pic. The hovercard, if you haven't heard the word before, is the card that pops up when someone hovers over your name.

(And thanks to the hovercards team!)
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