Looks like trying to invite a friend into beta isn't working. After hitting the Invite button on the webpage, it just refreshes and does nothing.
I have this problem as well. There is some sort of animation and then the button goes back to invite and it clears the email I typed in
It is now working, however the link that the "friend" is supposed to follow is not working.
Fiend invites are temporarily out of service, sorry for the inconvenience guys.
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