Declining ad revenue has led some publishers to hide their content behind paywalls.
In early days of the Internet, online advertising was mostly prohibited.
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In 2011, Internet advertising revenues in the United States surpassed those of cable television and nearly exceeded those of broadcast television.
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It includes email marketing, search engine marketing (SEM), social media marketing, many types of display advertising (including web banner advertising), and mobile advertising.
Like other advertising media, online advertising frequently involves both a publisher, who integrates advertisements into its online content, and an advertiser, who provides the advertisements to be displayed on the publisher's content.