Picasa Web Albums allows you to share photos, videos and albums with others. It has "Album Visibility" which allows you to control who can see your albums. There are 3 options i.e. "Public", "Limited, anyone with the link" and "Only you". You can unshare photo album by changing the album visibility.
To change a photo album visibility, go to your Picasa Web Albums account and click "My Photos" tab. Browse the photo album which you want to unshare. Select "Actions" tab and then select "Album properties". Select your visibility option in "Visibility" and then click "Save changes" button.
If you have shared a URL with someone, then you need to rename the album ot add the "Login required" option.
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