Search engine optimisation is not, and never has been about one parameter alone. Optimising a site is about the creation and promotion of good quality content that can be viewed, quite rightly as a valuable resource to the web or blogosphere.
Wikipedia defines it as a collective term, "encompassing all blogs and their interconnections. It is the perception that blogs exist together as a connected community".
Ignoring the likes of MySpace, Facebook, LinkedIn and the other portals is a search marketing crime and we have the solution to gain our clients the maximum exposure.