If you are looking to market your website on social media sites, reading these blogs is a great place to start: in order to succeed in social media you need to understand it properly.

For lack of a better way to organise the blogs, the most popular according to Alexa are at the top.

Mashable is the most popular social media blog on the net, offering all of the latest news on social networking and social software. You can find out about which social sites are getting funding, new startups and you get the odd gem such as 7 ways to create your own digg clone.

Alexa Ranking - 2,038

Technorati Authority - 12,589

Dosh Dosh was established in December 2006 and is authored by popular digg user Maki. The blog offers in depth articles about social media marketing, internet marketing and making money online. A fantastic recent post offers 12 must have tools for digg users.

Alexa Ranking - 10,023

Technorati Authority - 8,199

Social Media Trader was launched in December 2007 and is authored by Nick Christensen and Chris Woodley. The blog offers really great information about social media websites. They recently published a three month overview of social news and bookmark popular topics, excellent statistics for all social media marketers.

Alexa Ranking - 109,130

Technorati Authority - 129

Soshable was launched in January of this year and is authored by popular digg user JD Rucker (oboy). The blog offers articles about all of the major social news websites, tools and marketing tips. In a recent post how digg is dropping the ball, the author talks about how the quality of stories getting promoted on digg is diminishing due their anti marketing/SEO efforts.

Alexa Ranking - 120,216

Technorati Authority - 87

Muhammad Saleem is the no.2 digg user and an all round social media expert. On his blog he talks about the different social media communities and offers his expert opinion on all the latest goings on. In a recent post he talks about how reddit has hit the nail on the head by giving all of the sub-reddit posts a shot at frontpage success.

Alexa Ranking - 125,835

Technorati Authority - 403

In a nutshell social media describes online communities where members can communicate and socialize. Blogs, forums, wikis, video and photo sharing sites, social bookmarking and news sites and virtual reality sites are all all examples of social media. Here is a collection of links to help you get a better understanding:

Social Media E-Book - By Spannerworks provides information about the different types of social media sites.

Social Media Page - On Wikipedia provides a detailed definition along with examples of social media sites.

What is Social Media? - By Robert Scoble accurately describes social media by comparing it to traditional media.

These are the best 3 articles I could find, if you have any questions, please leave a comment and I will do my best to answer.