Social recruiting | Job searching
The evolution of the job board to social network is the tip of the iceberg. It's not about which is the best option or easiest to use; it's about content or data, getting into the mindset of the person that dictates what kind of data and experience is most relevant.
This is where search will go.
Matching data with your activities be they verbal discussions, e-mail, txt, blog posts, videos you watch etc. Google will use computer power to anticipate your next move and present what is relevant. If for example you talk about changing jobs with a few friends this will be 'heard' by the big machine and provide you with links. Maybe to recruiting videos on YouTube or a company blog in the relevant sector. If you are more specific 'I'm sick of working here' then it could be some jobs as your are 'active' in your desire to get a new job.
So the point is, it's about making sure employers/recruiters have as much data in circulation as they can. Jobs, blog posts, tweets, news etc. If it's not there it won't be found; and you've got to be in it to win it!