I am concerned about an online game, where can I report it?
You should contact the Video Standards Council (VSC) at firstname.lastname@example.org. The VSC is the only organisation which represents the whole of the video and games industries and as such is in a unique position to bring the various different sectors of the industries together to discuss and resolve matters of public concern.
If you are concerned with the behaviour of other players then use the games site abuse reporting proceedures.
If you are concerned about child grooming report it to CEOP - Child Exploitation and Online Protection Centre