We are running a contest and want to require users to have to login on Facebook or Twitter to cast a vote. The top ten list will update ever few minutes live as new people cast their votes. Does anyone have any suggestions for how to best do this?

I'm not sure I completely understand your needs. Have you tried connecting your website to the Facebook Open Graph API to allow the to register? Part of their API is detecting whether or not a user has liked specific content or not. Twitter has similar features. But unless you expand your inquiry, I don't know what else to say.

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