I finally understand what internet social marketing is all about. It isn't about who you know, it is about who knows you. That is, establishing a network on Facebook, Twitter or Linkedin (or others) is just the first step. Once you have connected, it is then up to you to create your public persona.
Why does that matter when you are seeking a job? Job seeking advisors recommend that you "brand" yourself. You can use emails, blogs and tweets to get your brand message across to your network, but this typically means actively managing your brand with a daily or weekly update.
I like the idea of updating my network, I just don't want to be tied to the computer to get the job done. Instead plan your brand message in advance, then use SocialOomph to schedule sending the updates to your Twitter and Facebook pages. You have created a brand campaign which can then be monitored and managed for success (getting your network to be aware of your knowledge and interest in your specialty).