the issue of privacy in networked computer

My mom is a business woman, she has two computers. The computer for her business work and materials, she never connects to the internet. She told me about that the Internet was dangerous, the reason she does it is because there are some issue of privacy in networked computer.

Privacy refers to the ability of an individual or group to seclude themselves or information about themselves and thereby reveal themselves selectively. Along with the development of computer science and internet, new issues concerning privacy start to emerge.

In my perspective, I think the first issue mainly focused on people have a lack of the awareness of privacy protection. Through my research, about 62% of people do not how to protect their privacy online.

Without the awareness of how to protect privacy online, people are generally vulnerable when someone violate their privacy online. 

Secondly, huge internet companies are stealing people's private information through their database and sell them to other companies. For instance, Hotmail and G-mail sell their clients information to related companies, in exchange for money. The users won't directly get hurt, but it is still disrespect to its users.

Also, Facebook and Google are using a similar approach to get a big amount of money.

Thirdly, the increasing number of professional hacker and people who want to know others' privacy for various purposes also become a issue of privacy in networked computer.

Finally, the lack of internet legal protection. According to the following data, 

the legislation system towards internet privacy is not integrated. Therefore, governments and relevant organizations need to set new laws and rules to protect one online privacy.