Steve Todd, EMC Distinguished Engineer:

Hopefully your corporation has a common social media backbone. In my corporation (EMC) we are using a tool from Jive Software known as Clearspace. This tool is a soapbox for every employee that wishes to publicly post a discussion, a blog, or a document. I’ve explained the importance of a corporate social media backbone in a previous post.

Spend some time every day on this type of site. Learn the interests of your co-workers, and find out what technology topics are hot within your corporation at large. It is OK to “lurk” initially (view without interacting), but make it your long-term goal to begin communicating with others.