Electronic networks spend quite a lot of time and money of the Internet users. In addition to the cost of investment to buy computers and other devices connected to the network, the user must pay a small sum of money to pay the cost of using each month. Besides, the electronic network is also not absolute safety, in addition to what the virus, spam, mail bomb there, leakage of personal information, or experiencing the unexpected accident such as faulty network, hackers vandalized ... cause many annoyances
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