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Main idea: Computers have changed the way the world works.

Proof (1):  Social Networking is on the computer and people like it more than talking to people in person. 

Proof (2):  There is games on the computer that alot of people like instead of playing board games.

Illustration (has a time word): One time I saw a game that I really liked on the computer so now I can see how much the world has changed by computers.

Conclusion (say your main idea again in a different and more interesting way) :   Computers have changed alot of how the way the world works.