Kune

• Alice sends an invitation to her own email
• Alice receives the email inviting her to Kune.cc
• Alice clicks on the link and kune.cc opens
• She was already logged in.
• She sees a message saying that "Alice" invited her, so she may want to make Alice her friend
• Alice accepts
• Another message appears, saying that Alice is inviting you to be her friend...
• Alice accepts
• Alice goes to her buddy list and sees herself as a buddy!! (check http://kune.cc/#!samer, the last friend is "samer")

• If the person that invited me to Kune is myself, don't offer friending
• If somehow I manage to offer friendship to myself, I shouldn't be able to accept (automatically rejected)
• If somehow I manage to accept, I shouldn't be listed as a friend in my buddy list...

I guess the third check is not needed if we ensure the first two.