A good example is Facebook Custom Audiences. Within this Facebook supports email targeting, the ability to upload customer email addresses and then target those users on Facebook with tailored ads. This lets you micro-segment based on your existing customer database. One application is customer loyalty marketing, promoting offers to existing high value users via Facebook ads.
Digital marketing is defined by the use of numerous digital tactics and channels to connect with customers where they spend much of their time: online. From the website itself to a business's online branding assets -- digital advertising, email marketing, online brochures, and beyond -- there's a spectrum of tactics that fall under the umbrella of "digital marketing."
Digital marketing is the marketing of products or services using digital technologies, mainly on the Internet, but also including mobile phones, display advertising,and any other digital medium.[1] Digital marketing channels are systems based on the internet that can create, accelerate, and transmit product value from producer to the terminal consumer by digital networks.[2][3]
The next milestone in the evolution of social marketing was the publication of "Social Marketing: An Approach to Planned Social Change" in the Journal of Marketing by Philip Kotler and Gerald Zaltman.[34] Kotler and Zaltman coined the term 'social marketing' and defined it as "the design, implementation, and control of programs calculated to influence the acceptability of social ideas and involving considerations of product planning, pricing, communication, distribution, and marketing research." They conclude that "social marketing appears to represent a bridging mechanism which links the behavior scientist's knowledge of human behavior with the socially useful implementation of what that knowledge allows."
Read Joe Pulizzi's excellent book Epic Content Marketing. I started reading it after I wrote this post and it confirmed and expanded what I already knew about content marketing, with much more detail than I could ever go into here. Something Pulizzi emphasizes which I originally left out was the importance of focusing on producing mobile-friendly content, since smartphones are becoming the dominant way in which most of our customers access content. Also read Michael Hyatt's Platform, mentioned above. Frequent websites like those of Content Marketing Institute, Ragan, Copyblogger, Michael Hyatt, and Gary Vaynerchuk and sign up for their email newsletters. It won't take you long to become not just familiar with content marketing, but an expert.

Simply put, digital marketing is the promotion of products or brands using electronic devices or the internet. It also includes text messaging, instant messaging, video, apps, podcasts, electronic billboards, digital television and radio channels, etc. Digital marketing uses multiple channels and technologies that allow an organization to analyze campaigns, content and strategy to understand what’s working and what isn’t – typically in real time.
The "sharing economy" refers to an economic pattern that aims to obtain a resource that is not fully utilized.[73] Nowadays, the sharing economy has had an unimagined effect on many traditional elements including labor, industry, and distribution system.[73] This effect is not negligible that some industries are obviously under threat.[73][74] The sharing economy is influencing the traditional marketing channels by changing the nature of some specific concept including ownership, assets, and recruitment.[74]
Organic is the fastest growing sector of the U.S. food industry. Organic food sales increase by double digits annually, far outstripping the growth rate for the overall food market. Now, an unprecedented and conclusive study links economic health to organic agriculture. This research identifies 225 counties in the United States in organic hotspots — counties with high levels of organic agricultural activity that have neighboring counties with high organic activity — and then looks at how these organic hotspots impact key county-level economic indicators. Organic Hotspots boost household incomes and reduce poverty levels — and at greater rates than general agriculture activity, and even more than major anti-poverty programs. Being an Organic Hotspot increases median household income by over $2,000 and lowers a county’s poverty rate by as much as 1.35 percentage points. 

Digital marketing channels and traditional marketing channels are similar in function that the value of the product or service is passed from the original producer to the end user by a kind of supply chain.[75] For instance, a typical digital marketing channel is email. Organization can update the activity or promotion information to the user by subscribing the newsletter mail that happened in consuming. In addition to this typical approach, the built-in control, efficiency and low cost of digital marketing channels is an essential features in the application of sharing economy.[75]

In the 1990s, the term Digital Marketing was first coined,.[12] With the debut of server/client architecture and the popularity of personal computers, the Customer Relationship Management (CRM) applications became a significant part of marketing technology.[citation needed] Fierce competition forced vendors to include more service into their software, for example, marketing, sales and service applications. Marketers were also able to own huge online customer data by eCRM software after the Internet was born. Companies could update the data of customer needs and obtain the priorities of their experience. This led to the first clickable banner ad being going live in 1994, which was the "You Will" campaign by AT&T and over the first four months of it going live, 44% of all people who saw it clicked on the ad.[13]
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