http://www.neowin.net/news/german-organization-claims-facebook-like-system-could-be-illegal
German organization claims Facebook 'Like' system could be illegal.
the company could use your 'Like' to track you for up to two years, and potentially longer.
Now, the ULD intends to pursue the matter. Any website hosted in Schleswig-Holstein must have removed the Like button before the end of September, lest they want to incur fines of up to €50,000 (roughly $72,000). They also advise people to avoid using the 'Like' system, and better yet, to avoid using Facebook altogether.
Traffic and content data are transferred to Facebook’s servers in the US and an analysis is sent back to the website owner concerning the usage.