I recorded a Social Media Marketing lecture (audio presentation) for publisher Henry Stewart Talks at the start of 2015.
The lecture picks up key themes that I've discussed elsewhere on this site, most recently in a post titled What is Facebook? (in 2015).
Henry Stewart Talks are a paid resource, and as a student you'll be able to access the full audio lecture if your institution are subscribers (Robert Gordon University where I work are, access via the RGU library). Without a subscription, you can view a demo.
As a lecturer in digital / social media or marketing, you may wish to use the talk in your teaching (some of my colleagues at RGU Aberdeen do).
For easy access to the Social Media Marketing lecture, here's a direct link to my talk on the HST website.