I delivered this presentation on June 13th at my keynote speech at the BDigital Congress in Barcelona. It covers the key aspects of influencer marketing. What are the foundations of influencer marketing ? What is influence and can it be measured ? What does it mean for brands and why should it be a key element of your digital marketing strategies ? What are the 4 main challenges for a successful execution ? I also outline the two main trends that will define the future of influence marketing