Limit the number of user account accounts for a given period?

Question

I have a web application that requires the user to have an account. This user can then vote “once” for a specific item. However, some users sign up many accounts for a “game” in the system.

Does anyone have any ideas how you can limit this type of thing?

Can I limit the number of registrations per day per IP address? (what is connected with this?)

Any other suggestions

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Answer 7

I would recommend implementing another authentication mechanism, such as OpenID, or, as Alex said, forcing users to provide a valid email address and send them email confirmation links before creating accounts.

My preference is OpenID.