Linkedin is growing rapidly in Europe. Back in July 2013 there were 57,165,000, while in December 2014 we are 83,310,000, which is a good 50% growth in 17 months. Check my interactive infographic: Linkedin in Europe in December 2014
The image below is not interactive, and won't tell you that Hungary is stronger than Germany. Probably this is the only good strength it has at the moment.