The Court of Justice of the European Union will hear arguments from Belgium's Data Protection Authority Oct. 5 in a case involving Facebook, Reuters reports. The DPA seeks to stop Facebook from tracking citizens through cookies stored on social plug-ins. Under the EU General Data Protection Regulation's one-stop-shop mechanism, the lead regulator for Facebook would be Ireland's Data Protection Commission. "The question is whether or not the one-stop-shop mechanism under the GDPR is exhaustive or leaves some room for local DPAs such as the Belgian DPA to enforce, in particular by bringing court proceedings before a national judge," said Aurélie Waeterinckx, a spokeswoman for the Belgian DPA. 
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