If there’s one thing that’s visible every day, it’s that users (& some administrators/developers) are easily confused.
Take for instance the “Find My Friends” misfeature on most Social Networking sites. None warn the user to go through and check that the invitations they are about to generate are really only going to their friends, and that they should only send mail directly to their friends, not to mailing lists.
I wonder how many suppliers get invitations to connect to customers whom they don’t really know on LinkedIn? How many mailing lists are invited to sign up and befriend FaceBook users? Some sites like Flickr limit their invitations to existing users, others need blocked from every mailing list.