We've talked before on the GradPost about using LinkedIn as a way to build your digital reputation, network, and search for jobs. Another great advantage to this professional social network is the plethora of groups focused on different career topics. Today, I came across Alternative PhD Careers, a LinkedIn group with nearly 7,000 members dedicated to exploring careers outside academia with a particular focus on the sciences. The discussion forums are very robust with thoughtful, informative answers from both professionals and current grad students.
While you're at it, browse the Groups directory at LinkedIn to find more discussion groups related to your industry or career paths in which you are interested. These groups are a great way to turn LinkedIn from a passive activity to a proactive job searching tool. You never know what connections you might make!