The social issues surrounding the use of computer networks are numerous and complex. Networks can be used to spread offensive content that some believe should be censored. Similarly, they enable the distribution of copyrighted material, leading to conflicts over enforcement. Network operators and governments are able to monitor communications, raising questions around privacy rights. The availability of information online has made it harder to determine the quality and veracity of information. Anonymity can be used to protect whistleblowers but can also shield criminals. Electronic junk mail and active content that can contain viruses have become commonplace. The convenience of networks has enabled new forms of addiction and excessive use.