I have a system for sign-up with no verification - but I think I'd like at least email verification sorted to prevent it from being too easy to create multiple accounts.
Social network links should be handy, as you could be offered a list of contacts, and asked if you want them to represent you for anything.
though - it seems facebook will no longer share this - even if someone gives them permission - they only allow access to a list of friends also using the app.
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