Execution of digital marketing strategies?

It is a fact that internet has totally changed the way people used to work. Internet has played a vital role in shrinking the world in a sense that now connecting to people 1000s of miles away is now possible with a click. The internet has also evolved or revolutionized the marketing industry. The tactics used to marketing brands or products decades ago are now almost outdated. Digital marketing is the new trend and now brands and companies are jumping into the bandwagon to help their brands or products get the maximum exposure.
Digital marketing is helping a lot of brands and companies to help their brands gain great brand awareness and brand engagement. There are various kinds of digital marketing techniques that can be implemented to make the brand win on the internet. These include, email marketing where brands use the strategy of sign ups to target products. Another type is search engine marketing that has its own two sections. One is search engine optimization where websites are optimized in a manner to rank keywords high on various search engines that include Google. Another section of search engine marketing is pay-per-click where ads are placed on Google on various keywords. Another important part of digital marketing is social media marketing where brands implement social media marketing strategies on platforms like Facebook, Twitter, Google Plus, Instagram and related social media sites. Another section of digital marketing is online reputation management. In this section, strategies are implemented to maintain the online image and reputation of the brand on the internet and to keep it as positive as possible. Digital marketing company services are responsible for executing and implementing a proper digital marketing strategy for the client.

These are various digital marketing strategies that can be implemented and executed to gain maximum exposure. The question is that is it necessary to execute all digital marketing strategies at once?