Kristen Lamb has an excellent series going on right now, all about blogging, that she updates every Wednesday. She knows her stuff, and I've learned a lot about social media from her blog.
Here are the links to that series. I'll try to keep it updated as she continues posting.
Part 1 - Meet the Bright Idea Fairy, then Shoot Her
Part 2 - Don’t Feed the Trolls
Part 3 - Tearing Up the SEO in 2011
Part 4 - The Future is Now
Part 5 - The Counterintuitive Nature of Social Media Influence
Part 6 - Maintaining Your Sanity and Your Blog
Part 7 - Fashion Faux Pas
Part 8 - Connecting with the Readers
Part 9 - Selling Our Blog to the Readers
Update: Kristen started a new series!
Part 1 - Blogging and Maintaining Our Sanity
Part 2 - The New Fast Food of Writing
Part 3 - Go Hard or Go Home
Part 4 - More Blogging Cowbell
Kristen has many excellent posts on social media. She's definitely worth a read!