about Social networks

Social networks are necessary for our life.
You may say it is dangerous to join social networks because someone may get your informations like e-mail address.
But if you don't share such informations on the Internet, you don't have to worry about that at all.
In addition, social networks enable us not only to make connection with others, but also to receive latest informations instantly.
For these reasons, I think social networks are essential for our life.
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