Instruct children to never tell ANYONE:
- Their age.
- Their real name.
- Any other on-line network name, including their e-mail address/es.
- Their address, their country or state.
- Their telephone numbers, land-line and mobile.
When registering to play on PlaneShift, an e-mail address is required but since this is not used by PlaneShift for any purpose other than confirming your registration and retrieving your password when you forget it, you can use: a 'disposable e-mail account'
Disposable e-mail accounts are free and designed for exactly this purpose.
http://www.mailinator.com/is an example.
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My experience when I first joined PlaneShift in 2004 was not a good one. A player started a role play conversation with me but then sent me a private message which was a URL to a porn site.
That player is still active in PlaneShift and on PlaneShift's IRC channel.
Other times players have positioned themselves so that the are sitting with their heads between other player's legs, simulating a sexual position.
It happens when a character is busy crafting so stationary, the sexual predator will use that opportunity to get their jollies.
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The fact is, if someone is a sexual predator in real life then they will be a sexual predator in-game. This is why your children should not let on they are children or any of the other details I mention above.
There is a log file kept for each character on their computer that shows exactly what has been said to them and by them so it will be worth locating that file from time to time to review what has been going on.