In 1998, two graduate students at Stanford University, Larry Page and Sergey Brin, developed "Backrub", a search engine that relied on a mathematical algorithm to rate the prominence of web pages. The number calculated by the algorithm, PageRank, is a function of the quantity and strength of inbound links.[22] PageRank estimates the likelihood that a given page will be reached by a web user who randomly surfs the web, and follows links from one page to another. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random web surfer.
The code of ethics that is affiliated with traditional marketing can also be applied to social media. However, with social media being so personal and international, there is another list of complications and challenges that come along with being ethical online. With the invention of social media, the marketer no longer has to focus solely on the basic demographics and psychographics given from television and magazines, but now they can see what consumers like to hear from advertisers, how they engage online, and what their needs and wants are.[101] The general concept of being ethical while marking on social network sites is to be honest with the intentions of the campaign, avoid false advertising, be aware of user privacy conditions (which means not using consumers' private information for gain), respect the dignity of persons in the shared online community, and claim responsibility for any mistakes or mishaps that are results of your marketing campaign.[102] Most social network marketers use websites like Facebook and MySpace to try to drive traffic to another website.[103] While it is ethical to use social networking websites to spread a message to people who are genuinely interested, many people game the system with auto-friend adding programs and spam messages and bulletins. Social networking websites are becoming wise to these practices, however, and are effectively weeding out and banning offenders.
If you're focusing on inbound techniques like SEO, social media, and content creation for a preexisting website, the good news is you don't need very much budget at all. With inbound marketing, the main focus is on creating high quality content that your audience will want to consume, which unless you're planning to outsource the work, the only investment you'll need is your time.

As mobile devices become an increasingly integral part of our lives, it’s vital that marketers understand how to effectively communicate on this unique and extremely personal channel. Mobile devices are kept in our pockets, sit next to our beds, and are checked constantly throughout the day. This makes marketing on mobile incredibly important but also very nuanced.
Shifting the focus to the time span, we may need to measure some "Interim Metrics", which give us some insight during the journey itself, as well as we need to measure some "Final Metrics" at the end of the journey to inform use if the overall initiative was successful or not. As an example, most of social media metrics and indicators such as likes, shares and engagement comments may be classified as interim metrics while the final increase/decrease in sales volume is clearly from the final category.

To avoid undesirable content in the search indexes, webmasters can instruct spiders not to crawl certain files or directories through the standard robots.txt file in the root directory of the domain. Additionally, a page can be explicitly excluded from a search engine's database by using a meta tag specific to robots (usually ). When a search engine visits a site, the robots.txt located in the root directory is the first file crawled. The robots.txt file is then parsed and will instruct the robot as to which pages are not to be crawled. As a search engine crawler may keep a cached copy of this file, it may on occasion crawl pages a webmaster does not wish crawled. Pages typically prevented from being crawled include login specific pages such as shopping carts and user-specific content such as search results from internal searches. In March 2007, Google warned webmasters that they should prevent indexing of internal search results because those pages are considered search spam.[47]
Understanding Mobiles: Understanding mobile devices is a significant aspect of digital marketing because smartphones and tablets are now responsible for 64% of the time US consumers are online (Whiteside, 2016).[44] Apps provide a big opportunity as well as challenge for the marketers because firstly the app needs to be downloaded and secondly the person needs to actually use it. This may be difficult as ‘half the time spent on smartphone apps occurs on the individuals single most used app, and almost 85% of their time on the top four rated apps’ (Whiteside, 2016).[44] Mobile advertising can assist in achieving a variety of commercial objectives and it is effective due to taking over the entire screen, and voice or status is likely to be considered highly; although the message must not be seen or thought of as intrusive (Whiteside, 2016).[44] Disadvantages of digital media used on mobile devices also include limited creative capabilities, and reach. Although there are many positive aspects including the users entitlement to select product information, digital media creating a flexible message platform and there is potential for direct selling (Belch & Belch, 2012).[46]

Collaborative Environment: A collaborative environment can be set up between the organization, the technology service provider, and the digital agencies to optimize effort, resource sharing, reusability and communications.[38] Additionally, organizations are inviting their customers to help them better understand how to service them. This source of data is called User Generated Content. Much of this is acquired via company websites where the organization invites people to share ideas that are then evaluated by other users of the site. The most popular ideas are evaluated and implemented in some form. Using this method of acquiring data and developing new products can foster the organizations relationship with their customer as well as spawn ideas that would otherwise be overlooked. UGC is low-cost advertising as it is directly from the consumers and can save advertising costs for the organisation.

To create an effective DMP, a business first needs to review the marketplace and set 'SMART' (Specific, Measurable, Actionable, Relevant and Time-Bound) objectives.[62] They can set SMART objectives by reviewing the current benchmarks and key performance indicators (KPIs) of the company and competitors. It is pertinent that the analytics used for the KPIs be customised to the type, objectives, mission and vision of the company.[63][64]
This involves tracking the volume of visits, leads, and customers to a website from the individual social channel. Google Analytics[110] is a free tool that shows the behavior and other information, such as demographics and device type used, of website visitors from social networks. This and other commercial offers can aid marketers in choosing the most effective social networks and social media marketing activities.
On April 24, 2012 many started to see that Google has started to penalize companies that are buying links for the purpose of passing off the rank. The Google Update was called Penguin. Since then, there have been several different Penguin/Panda updates rolled out by Google. SEM has, however, nothing to do with link buying and focuses on organic SEO and PPC management. As of October 20, 2014 Google has released three official revisions of their Penguin Update.
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.[76] 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.[76]
People aren’t just watching cat videos and posting selfies on social media these days. Many rely on social networks to discover, research, and educate themselves about a brand before engaging with that organization. For marketers, it’s not enough to just post on your Facebook and Twitter accounts. You must also weave social elements into every aspect of your marketing and create more peer-to-peer sharing opportunities. The more your audience wants to engage with your content, the more likely it is that they will want to share it. This ultimately leads to them becoming a customer. And as an added bonus, they will hopefully influence their friends to become customers, too.
Connecting the dots between marketing and sales is hugely important -- according to Aberdeen Group, companies with strong sales and marketing alignment achieve a 20% annual growth rate, compared to a 4% decline in revenue for companies with poor alignment. If you can improve your customer's' journey through the buying cycle by using digital technologies, then it's likely to reflect positively on your business's bottom line.
In 1998, two graduate students at Stanford University, Larry Page and Sergey Brin, developed "Backrub", a search engine that relied on a mathematical algorithm to rate the prominence of web pages. The number calculated by the algorithm, PageRank, is a function of the quantity and strength of inbound links.[22] PageRank estimates the likelihood that a given page will be reached by a web user who randomly surfs the web, and follows links from one page to another. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random web surfer.

Inbound marketing refers to a marketing methodology wherein you attract, engage, and delight customers at every stage of the buyer's journey. You can use every digital marketing tactic listed above, throughout an inbound marketing strategy, to create a customer experience that works with the customer, not against them. Here are some classic examples of inbound marketing versus traditional marketing: 
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