Excessive voting

Good day

I’m really hoping you can help.

I am running a baby photo competition where people are requested to vote for their favourite baby – most votes are coming from facebook friends and friends and family e-mail addresses.

The majority of the votes (417 entries) are currently in the range of 30 to 80.

i have set the “Voting Frequency Settings to
“Once – user can vote only once per rating”

I now have a few entries that are way over 300 votes some even 1300.

Is there a way that I can find out where these votes are coming from (IP address/s or something along those lines)

Am receiving a lot of mails from irate moms who are also noticing this which is clearly being seen as cheating

Any assistance as to how I can sort this out.

Thanks

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