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The 900-Number Rule requires that ads for pay-per-call services disclose the cost of the call. Ads for services that promote sweepstakes or games of chance, provide information about a federal program (but are not sponsored by a federal agency), or target individuals under 18 years of age require additional disclosures. Ads for 900-numbers cannot be directed to children under 12 unless the ads deal with a bona fide education service, as defined by the Rule.

Affiliate marketing overlaps with other Internet marketing methods to some degree, because affiliates often use regular advertising methods. Those methods include organic search engine optimization (SEO), paid search engine marketing (PPC – Pay Per Click), e-mail marketing, content marketing, and (in some sense) display advertising. On the other hand, affiliates sometimes use less orthodox techniques, such as publishing reviews of products or services offered by a partner.[citation needed]

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