Here are a few of this week’s “must reads” from our feeds:

The Four E’s of Social Media and Sustainability
The TakeAway: Sustainability Leaders Need to Use Social Media to Exchange, Educate, Engage, and Enhance.

25 Awesome PR Blogs You Should be Reading
’nuff said.

What It Takes to Build a CSR Communications Program
A 101 primer on what Corporate Social Responsibility is and some key tips.

Websites Are to Digital Strategy as Models Are to Fashion, but do We Really Need Them?
Though brands today live a decentralized, if not fragmented, existence, it’s important to have a smart website to feed and refresh the brand.

The Future of Social Media and PR
Despite the changing landscape of PR, the most effective communication still remains unchanged: Building relationships with the most influential press in your space.

Web Users Increasingly Rely on Social Media to Seek Help in a Disaster
Social media sites are the 4th most used resource for disaster information from the American Red Cross survey.

CSR and Sustainability Should Not Stand Alone
Campbell Soup Company’s VP of Sustainability shares his lessons of CSR.

IBM + Tumblr + You = Smarter Cities
Next American City & IBM are using Tumblr to organize ideas and content about new urban policy ideas.