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Online advertising, also called online marketing or Internet advertising or web advertising, is a form of marketing and advertising which uses the Internet to deliver promotional marketing messages to consumers.
In 2011, Internet advertising revenues in the United States surpassed those of cable television and nearly exceeded those of broadcast television.
Many common online advertising practices are controversial and increasingly subject to regulation.
Online ad revenues may not adequately replace other publishers' revenue streams.
Declining ad revenue has led some publishers to hide their content behind paywalls.
In early days of the Internet, online advertising was mostly prohibited.