The best way of looking at consumer web applications is as a complex stack of “pulls” and “pushes.” Lest these terms be confused with an earlier generation of push: a “pull” is an unsolicited action by a consumer, whereas a “push” is a solicitation by a seller/producer. The consumer ultimately “pulls” from a mobile phone or computer. Everything else is “pushed” to the consumer, through ads, e-mails or other marketing efforts from companies eager to get business and traffic.
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The Power Of Pull