What is the best way to implement photo voting?

Question

Social media

The essence of the matter is simple...
On the site I want to make a vote for a photo, but the main task is to have unique votes, but at the same time not to bother the site user.
I can make a separate page for each vote using social networks, but then the question arises, how then to collect statistics and identify the winner?
well, or maybe someone will tell you the vote collection module, even if at least 1 time per day, no more than
bind to IP, no way (