I recall seeing this option when I created my album, but I don't know how to get back to it. If you email the photo album to a friend, it makes them sign up before they can view it.
The correct way currently is via Alex answer of going to the cogwheel and selecting share.
There is a really nasty way, i do often. In before, it can take long to do this, so let me explain it: You go through the photos in the album and then rightclick on the pictures and do "copy image location" then you send him those links.
It is really a thing i do not do often, cause it is exhausting.
I would kind of suggest you to use dropbox or something easier.
Press "edit photos" then right at the bottom (underneath the "save" button) is the public link. Labeled as such.
protected by Community♦ Jan 2 '13 at 17:44
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