Corporate PR can have many different platforms including internal and external functions. Internal functions of corporate PR can range from employee social media, such as a blog, to an internal newsletter highlighting employee affairs. External PR for corporations can be vaster and include numerous messages to various publics. In my experience with Comcast-Spectacor, I worked in community relations, or CSR (Corporate Social Responsibility), which is just one of the ways corporations exercise public relations. Another, and more publicized function of PR in corporations, is crisis communications. Crisis communications is typically executed in-house and is a part of the existing PR team, however, depending on the size of the company and the severity of the situation, crisis communications teams can be brought in to asses a particular case. More recently, corporations are using social media, and social media contests, to connect and engage their publics.
The main function of corporate PR is to connect with various publics using means such as press releases, social media, products and events to facilitate the building and managing relationships. No matter what PR industry you chose one thing remains the same, knowing your audience is essential to running and executing an effective PR strategy.