Here are a few of my favorite sites for marketers, I’ll be adding to this over time. If you have suggestions of great sites, please send them to me.
LinkedIn: linkedin.com (there are many marketing groups here, as I learn more about them, I’ll post updates and list actual groups to join)
Hubspot: Hubspot.com – great resource, useful content
SocialMediopolis: http://socialmediopolis.com – social media marketing resource
Digital Doughnut: http://digitaldoughnut.com – digital marketing resource and community