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Re:Flickr: Invitations disclosure (resend feature) by Sovietaced on Sunday April 06, 2014 @05:10AM (#7540359)
Exactly what I was thinking, expiration isn't even necessary.
Re:Flickr: Invitations disclosure (resend feature) by kngspook on Sunday April 06, 2014 @06:16AM (#7540488)
Of course, hashing _and_ expiration would be best.

I'm not really seeing any good reason _not_ to expire them...