Net neutrality is the principle that Internet service providers and governments should treat all data on the Internet equally, not discriminating or charging differentially by user, content, site, platform, application, type of attached equipment, or mode of communication. The term was coined by Columbia University media law professor Tim Wu in 2003 as an extension of the longstanding concept of a common carrier. There has been extensive debate about whether net neutrality should be required by law, particularly in the United States. Debate over the issue of net neutrality predates the coining of the term. Advocates of net neutrality such as Lawrence Lessig have raised concerns about the ability of broadband providers to use their last mile infrastructure to block Internet applications and content, and even to block out competitors. Neutrality proponents claim that telecom companies seek to impose a tiered service model in order to control the pipeline and thereby remove competition, create artificial scarcity, and oblige subscribers to buy their otherwise uncompetitive services. Many believe net neutrality to be primarily important as a preservation of current freedoms.