Our voting restrictions ensure only one vote can be cast on a photo from a single IP address to minimise cheating but here is a bit extra. The report should be fairly explanatory; it contains the following information:
Login Method for voters - how many people logged in with Facebook, Twitter or Email respectively. A lot of people logging in via email may indicate that someone is creating fake email accounts.
Top IP addresses of voters - due to our voting restrictions this should contain only unique ip addresses.
% of votes from different locations - indicates geographic locations, and the percentage of votes that came from them. A lot of the votes should generally be from the same location as the entrant, and a wide geographic spread may be cause for suspicion.
Voters with low facebook participation - indicates any voters with low 'participation' (e.g. no photos uploaded, limited wall posts) that may indicate a fake account.
Voters with no friends in common with the entrant - indicates any voters who aren't friends-of-friends with the voter. This can be a good indicator of whether or not the entrant is using a 'Voting Ring'-style group to game the system.