Business reporter Jean Chatzky points out the advantages of social networking (Facebook, Twitter, etc.) to job seekers in her latest column:
Say you're looking for work in marketing. You might post an article about a company that's employing an innovative strategy or new technology that makes connecting with customers easier. This shows that although you've been out of work, you're keeping up with trends in the field, and a company won't lose time bringing you back up to speed if they hire you.