Isolating the chat will not all together keep your child innocent on blockland. There are ways to spell words out with bricks and you can build WHATEVER you want to, that would include genitalia and any form of object you would consider inappropriate. I would suggest that if your child wants to play with other people in a pure environment, you setup a LAN server in your house so your child can play with family members or friends, instead of online. I am just stating this so you know what is in blockland and who plays it.