Authentic relevant content targeted to mobile social newsfeeds. I really think its as simple as that. However, the execution requires a full range of marketing skills, from creative to analytics.

More personal touch and acknowledging the connections, commonalities, and similar interests will have a heavier impact on digital marketing and business. We find it hard to trust the right people to do business with and many people are not open to doing business with random act of digital marketing. Take this prime example, there is a reason we have spam mail, filters in our email accounts, and privacy on our social media accounts. There are all the reasons why we sometimes get so vexed with marketing emails because they dont have a true person behind it. It is just a tool. Hence, making that personal connection along with the acts of digital marketing will add more value to business growth.

It really depends what sort of business you are in. If it is B2B then I would say industrial magazines, Exhibitions and Experience and reputed business development personnel which should be known in markets.

Difficult question to reply too, as someone already mentioned it depends about your business (e.g. IT, services, products, etc.), which is your goal, which markets you want to reach out, in which country or regions, what is your starting point, etc. With more detailed information it would then be possible to set up an action plan and choose the right marketing techniques and digital channels

Short answer - hyper contextual and hyper personalized omni-channel engagement
Long answer - Fundamentals will always be the same. The intent was always to unerstand the needs and wants of each customer and deliver an exciting proposition to her. This was naturally impossible to execute, until recently, and hence the segmentation approach. The emergence of big data analytics powered by machine learning (ML), deep learning and Artificial Intelligence (AI) presents a very real opportunity to uniquely target each and every customer. And already digital tools are being developed to offer turnkey solutions. This then creates the best case scenario for any marketer.
The muscle alone was missing, now it's here.