Well, obviously, most people would think of advantages like global communication. But personally I think the disadvantages are much more than advantages.
For instance, Racism, Terrorism, Lost of Culture and Tradition, Negative Influences From Other Countries (Including homosexuality) and The Overgrowing of Immagrants in Particular Places such as America and Australia.

老鬼說一句，上了大學你就知道500words is just a piece of cake. An article for a 20-minute presentation requires more than a thousand words...

？？？作文題目中竟然有不會的單詞真是太恐怖了~