But in parallel with the above mentioned benefits, the Internet still exists the harm due to some bad parts. Some hackers have written sections of the destructive programs that call with the name of the virus, trojan, spyware, ... and spread on the net, just access the Internet then these programs will infiltrate your computer. Kind will self-replicating make spend hard but there type will destroy the system, damaging the whole operating system. Worse than they can steal data, information leakage, as customer's account in the Bank, causing huge losses to the company, the business.Recently, many Internet users in Vietnam proved the pressing about some online social networks used to put the information content of propaganda against the State, saying Vietnam breaking bad mode, violation of regulationslaw and national security threats. These people are mostly overseas reactionary elements using the Chameleon of a number of youths in the country to overthrow the regime. Besides, there are many sites that give the news, pictures, video clips, depraved, even take pictures of themselves onto the net to search for objects that cause adverse ethical, lifestyle of youth, students today. So, every Internet user should acquire information selectively and vigilance before the bad information.
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