Our friend Trevor Cook, a well known blogger and PR guru, has released a fantastic online guide to Social Media.

What is Social Media?

The online communities, technologies and practices that people use to share news, opinions, insights, experiences, and perspectives.

The paper includes lots of new stuff on emerging communities such as second life, wiki’s, twitter, myspace, facebook aswell as “traditional” social media – blogs, rss, podcasts and more.

Check it out – Guide to Social Media