The freedom of speech that you find in social media does not fit well under the structured, rigid, time limited and regulated environment that corporate communications departments are.
Corporate advertising and communications among fortune 100 companies is in many cases outsourced and executed under the supervision of the internal corporate teams. However, most plans are developed around a specific strategy that may include new product launch, branding, new stores promotion, etc. These campaigns have a time limit and even though they may integrate several strategies, media and departments, once the term runs out, everything comes to a complete stop.
That is not a conversation. Would you do that to a friend, a customer or relative? Definitely not. You see this people on a regular bases, you talk to them and share information. I guess corporations need to change the model and learn the basic concepts of being part of a social group regardless of where it takes place.
Read this report from Weber Shandwick for more on Social media and corporations http://bit.ly/3uHluw