Yes, this website is totally legal. All we are doing is allowing people to share freely available information in a way that can be of use to Landlords and Letting Agents. It is no different than someone telling their friend about how their tenant ruined their property etc.
We do however state that all information posted is the responsibility of the person who posted it - and if any legal issues arise from it (ie if it is false, slanderous etc) - we will co-operate fully with any legal demands.
For Letting Agents, they need to make sure that their tenants are aware of this website, and that they may appear on this website if they do cause disruption or trouble to the landlord. This can be done by adding a few lines to the Tenancy Agreement stating such, or alternatively use our Tenancy Agreement generator free of charge, after logging in.