Wall Street Journal: Services combine social media, marketing
Impact Media: Google’s MySpace acquisition poses challenges for SEO
Clickthrough Marketing: AdWords Certification can boost SEM
CNN Money: Social Media use increases 82%
ClickZ: 9 insights to help guide your SMM program
Search Engine Land: The 5 rings of conversion optimization
BONUS:
How to use LinkedIn for Business, a (very helpful) free PDF e-book by HubSpot