Below is a list of sales, marketing and social media blogs. I haven’t read all of them and this list definitely is not complete. There are literary thousands of blogs available for you. Please let me know if I should add any blogs to the list below.

Sales – 

A Sales Guy (Jim Keenan)
Alex Valassidis, Sales & Sales Management Consulting
Babette Ten Haken
Barb Giamanco
Bernadette McClelland’s Blog
Chaos Inside My Head (Tim Ohai)
Close.io
Connect2Sell (Deb Calvert)
Dave Stein’s Blog
EDGY Conversations (Dan Waldschmidt)
Enterprise Sales Meetup Blog
Fearless Selling (Kelley Robertson)
Fill the Funnel
Geoffrey James on Inc.com
Hubspot Inbound Sales Blog
Increase Sales Blog (Leanne Hoagland-Smith)
Inside Sales Experts Blog
Inside Sales Lessons and Insights (Chris Snell)
Jeff Shore
Jeffrey Gitomer’s Sales Blog
JFBlogit
Jill Konrath’s Sales Blog
Keith Rosen
Linda Richardson
Miller Heiman Blog
More Clients, Ian Brodie Blog
New Sales Coach (Mike Weinberg)
No More Cold Calling (Joanne Black)
Partners in EXCELLENCE Blog (Dave Brock)
R.E.A.L Sales Tips (Jonathan London)
Rothstein Consulting Blog
Sales Gravy “The Sales Talent Community” (Jeb Blount)
Sales & Marketing Effectiveness
Sales and Management Blog (Paul McCord)
Sales Enablement Perspective (Tamara Schenk)
Sales Leadership (Colleen Stanley)
Sales Management Blog (Steven Rosen)
Sales Management Challenge (Lee B. Salz)
Sales Motivation Blog (Mark Hunter)
Sales Pro Insider (Nancy Bleeke)
salesSHIFTBlog (Jill Harrington)
Selling Fearlessly (Robert Terson)
Smart Calling (Art Sobczak)
Smart Selling Tools (Nancy Nardin)
SmoothSale Blog (Elinor Stutz)
The Fine Art of Selling
The Irreverent Sales Girl (Dianna Smith)
The LinkedIn Insider (Kurt Shaver)
The Pipeline (Tibor Shanto)
The Sales Blog (Anthony Iannarino)
The Sales Leader Blog (Colleen Francis)
The Whale Hunters (Barbara Weaver Smith)
Topline Leadership Blog
Understanding the Sales Force (Dave Kurlan)
Viewpoint, The Truth About Lead Generation (Dan McDade)
Vorsight
Will Reed Blogs
Yesware Blog

Marketing and Social Media –

Affiliate Marketing Blog (Shawn Collins)
Aimclear Blog
BrandFuzion Blog
Bryan Eisenburg’s Blog
Buffer
Content Marketing Institute
ConversionXL
Convince & Convert (Jay Baer)
Copyblogger
Copy Hackers (Joanna Wiebe and Lance Jones)
Creative Guerrilla Marketing
Danny Brown (his motto is “there’s more to life than social media”)
Drew’s Marketing Minute (Drew McLellan)
Duct Tape Marketing (John Jantsch)
Email Institute
The Freelance Strategist
Jeff Goins
Groove
Hello My Name is Blog (Scott Ginsberg)
Help Scout
Hubspot Marketing Blog
Inbound.org
Jeff Bullas
Joel Gascoigne
Kriisti Hines
Mack Web Solutions
Maria Milea
Marketing Land
Marketing Over Coffee
Marketing Tech Blog
Marketing Profs
Matt on Marketing (Matt Heinz)
Modern B2B Marketing
Moz
Okdork (Noah Kagan)
ProBlogger (Darren Rowse)
Raven Tools
Rabbut Blog
Seth Godin
Startup Marketing (Ryan Gum)
The Future Buzz
Top Rank Blog (Lee Odden)