I'm extremely excited to send invites out to friends and family as soon as it launches publicly.
As of right now it's in a field trial and only available to a small number of external people.
I actually had a really great use case for Circles recently and wished that I could use my personal account. I went to Vegas and had a bunch of photos I only wanted to share with certain people. If I had the ability to create a circle and limit the privacy of that album, I would have been a happy camper.
I had to manually select all 20-30 people and give them access to the album though. Kind of a pain in the ass.
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