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After seeing, possibly playing Second Life, what do you think of a virtual 3d Internet? Pros and Cons?

Pros
Tony has something to do when he gets bored.

Cons
The more realistic a virtual world becomes, the more possible it would be for people to get sucked into forgetting that they live in a real world and just live in the virtual world. Why bother leaving your house when you can go into stores, meet people et cetera from you home? What happens if it becomes so realistic that people no longer see the point in doing anything in the real world?