If it is a multi-user system, the server cannot tell what user on the system connected. Until recently, the agency responsible for registering most Internet Domain names only confirmed that the requested name was unique. Consequently, an Internet user has no dependable way of identifying and authenticating an individual or organization on the Internet. You should be at least as cautious using the Web for sensitive matters as you would be discussing something confidential on a public or cellular telephone. The costs associated with recovering from losses can be minor or major.
Users can spend days recovering from a virus infection.
Data corruption is more difficult to discover and recover from, since there may be no obvious symptoms. Some remedies exist to reduce some of the risks to a Web reader. The easiest to implement are those based on loss avoidance. If you don't use the Web, you're not exposed to its dangers. If you never download executable code, your system won't be infected by a virus.