Brian Halligan and Darmesh Shah have turned out a quick and accessible read about how to get your customers to come to you. In the traditional way of lead generation, or "outbound marketing," companies seek out customers by utilizing direct mail campaigns, cold calling, or even, in the iconic case of the traveling salesman, banging on doors.

The Internet and all the outlets that have come with it have changed that. Now you can use blogs, search engines, and social media--"inbound marketing"--to create a library of content for your company and brand that engages an audience and brings them to you. You can also find hours of free online training at Inbound Marketing University.

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