Since Internet provides a convenient, cheap and fast way to share the data and ideas around world; the differences between cultures and laws in different country may challenge each other.
US legal system is based on case law and hasn’t caught up with the Internet
The Internet allows a computer in country X to communicate with a computer in country Y, but laws differ
Consequence: there is no easy way to stop problems like spam, false advertising, and online scams
Some country may use network censorship to monitor their residents' behavior.
Unbalanced network usage
US-centric