Next strange thing: I never used the function “Invite a Friend”, but I’m in the top 10 list, including my e-mail-address 
Did you do some tests with my account?
I’ve split this off into a separate topic;
I have to admit I don’t know much about the referral process, but I’ll find out and make sure that e-mail addresses are not displayed there either.
Watch this space
The e-mail address is no longer displayed in this panel