(Note: I won't name any website here, as I have no time to deal with people suing me, but it pretty much applies to any rating based website).
Just wondering as I am traveling in Vietnam and I had the following conversation with an hotel owner (HO):
HO: I want to create an hotel reservation website as my friend makes 30.000 U$ a month with hers.
ME: cool, how good are you with computers?
HO: I'm very good. I can change IP
ME: what do you change IP for?
HO: I can leave good ratings about my hotel.
ME: ????
HO: Yes, I do this a lot.
I always wondered how they dealt with it.
It seems it's not that easy.