My ex landlord keeps putting up fake reviews of the complex that he is asst Mgr of How can he be outed?

I lived in an AWFUL apartment back in Texas and I and others have reviewed it on Apartment Ratings dot com and no one gives it good marks. The asst Mgr keeps adding good reviews but it is obvious he is the one placing the reviews says the same things in the same way each time but uses different email accounts. How can he be stopped? Should I just let it go? It was like living in the Third World in that place!! That is the only apartment I have ever had trouble and I want people to know how bad it is but is it worth it to keep sparing with this guy online? I think he may be a sociopath or maybe just money hungry, I don't know which.