Jay Baer has a good blog post that outlines 39 social media tools that he uses and that would be of value to most communicators.

We have sent a link to his blog to the AHA Crew for a quick review. At AHA, we are always focused on improving our skill sets and knowledge. A list like this allows each of us to do a check on what we are using and what we might check out. With social media, tools and technologies change so quickly that it is easy to stick with ones you know, rather than check out something new—and possibly better.

This is an excellent list that is worth reviewing to see what you are using and what might be of value to you.