Google+ and Picasa Web Albums: Who can see the people I've shared with?

When you share photos and videos on Google+, the people that see your post or album will also be able to see who you've shared a post with and see who you've shared an album with. Albums created before signing up for Google+ are an exception. To be clear:

For albums created before signing up for Google+

No one but the owner of the photos can see who the post (and photos) are shared with.

For albums created after signing up for Google+

Anyone that can see the post in Google+ can also see who the post (and photos) are shared with.

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