Only virtual 3d chat I know is imvu.com
try it. Though it has some adult stuff too.
but I think there is underage filtration facility available

TCP stands for Transmission Control Protocol.
its a protocol used to send data over the network. It promises the reliability that the data will be transferred with out an error.its is basically used in application transfering important data.
the other protocol is UDP which stands for user data gram protocol it don't promises the data … Read more

Video Graphic Adapter...
its basically a device which provide output to your screen.
there are different kind of VGAs available each have different working mechanisms

Hey if you have access to the computer where your kids using facebook.
you can install any key logger in the system. Let your kids use facebook .the key logger will record every key your kids pressed.
you can check logs afterward.
its the best solution I guess.