Normally with most sites they have a copyright infringement process laid out within it's terms and conditions. For example - on my sites I generally require people to write to me at a postal address - outlining the details. This cuts down on those who wish to complain for the sake of just being a nuisance. If people email me - I simply refer them to the terms and conditions. I do have some sites where I accept emails - it just depends on how the site is set up.

My advice - check the terms and see more conditions for POF and see what the specified notification procedure is.

/DM