I went to the Marcom10 conference last week in Amsterdam and followed an interesting session about Social Media Strategy given by Hans van der Meulen from WDM.
WDM conducted a survey in the Netherlands (Social Media Barometer) to understand the average usage of Social Media by Dutch people.

Some interesting insights were surprisingly the low number of people that actually use Twitter in the Netherlands (6%) , the large number of people using Hyves on a daily basis, the increasing number of people using Facebook, and the relatively large number of people reading blogs (30%).

Seeing these numbers only strengthens my opinion on focusing on creating a sensible strategy for reaching your customers , whilst using the social media tools that they use too.