Agile marketing is about evolutionary survival

Since the late 1990s, marketers have been faced with, and survived, several big extinction moments.
The first marketing extinction moment happened with the widespread adoption of cloud software for product development, first in the software industry and then quickly spreading to all product verticals due to increased cycle time speed. Product development teams could no longer wait for yearly marketing budget waterfall strategy or processes.

A few years later, the evolutionary climate got even more disruptive as social networks added to the speed of change by removing the barriers between audience and company. 

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Marketing is not software. Marketing comes from more divergent psychological realms like emotion, brand impression, artwork, persuasion, and the like, creating two main problems for marketing people:

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That means there is no “one best way.” The tactics that work for one firm’s marketing, almost never work the same for another firm.

http://venturebeat.com/2015/09/29/agile-marketing-is-about-evolutionary-survival/ 

Your First Sprint

For your first Sprint, assign a rough estimate, in terms of man days, for each user story.
http://www.agilemarketing.net/sprint/

How to Write Agile Marketing User Stories

http://www.agilemarketing.net/agile-marketing-user-stories/ 

Agile marketing: the 70:20:10 rule

https://econsultancy.com/blog/62965-agile-marketing-the-70-20-10-rule 

What is agile marketing and why do you need it?

It’s certainly true that social media has spurred the rise of agile marketing, and it’s the reason why marketing teams are more readily adding it to their strategies.
Social happens in real-time, particularly on channels like Twitter where comments appear in chronological order without an algorithm (for now).
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Ashley Friedlin recently discussed agile marketing on the blog, and he suggests a 70:20:10 rule for marketers.
70% of your marketing should be planned ‘marketing as usual’ activity. 20% of your marketing should be programmatic, which is to say machine-driven marketing that automatically responds to various actions of the user. 10% of your marketing should be entirely agile. Reacting to news and events as and when they happen.
https://econsultancy.com/blog/65184-what-is-agile-marketing-and-why-do-you-need-it/