EU regulators wrangle over Twitter data privacy penalty

But it said Thursday that its counterparts in other countries - so-called concerned supervisory authorities - challenged a draft decision it circulated in May.

Under the EUs General Data Protection Regulation, a single regulator takes the lead role in cross-border data privacy cases as part of a one-stop shop system.

But in this system, the main regulator has to share its draft decision with regulators in other EU member states and take their feedback into consideration. The Twitter case could foreshadow more disagreements and delays that Irish authorities may face as they wrap up about two dozen other investigations involving the Silicon Valley giants.

The Twitter case stems from a security breach that affected its Android app users and let anyone view protected tweets over more than four years.