The book, titled 'Public Relations and the Social Web', includes advice on how to harness the benefits of social media and avoid the pitfalls.
Aimed at PR and marketing professionals, the book looks at social media from a UK perspective and aims to demystify the confusion surrounding the dangers for organisations getting involved in discussion online.
It also examines the theme of digital PR versus search engine optimisation and new ethics.
Brown said: "The book is about how radically PR is changing but it's about democracy as much as it is about PR.
"What it really addresses is the democratisation of communications and how that in turn is bringing about the democratisation of business and commerce."