Author and professional speaker, David Meerman Scott, first published his seminal book 'The New Rules of Marketing & PR' back in 2007.

What hasn't changed in the past six or so years, David says, are the basic strategies of marketing in an ever-evolving hyper-connected world. What has changed are the tools that we use to publish our content on the web and engage with our audience.

In the years prior to launch when David was writing the book, Twitter wasn't up and running, Facebook was only for college students, while MySpace had four times the number of users as Facebook did back then, and "we had this weird thing called Second Life", David says in the interview.

Fast forward to the latest edition (the fourth) of the book and it has coverage of Twitter and Facebook naturally, but also the likes of Google+, Instagram and Pinterest.

Best-selling author, David Meerman Scott