BBC News
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The Irish Data Protection Commission is to launch an investigation into a data leak in which the details of hundreds of millions of Facebook users were published online.
It had previously been looking into claims from Facebook that the data was old, from a previously reported leak in 2019.
But it now says that there could have been a breach of data laws.
Facebook said it was "co-operating fully".
In a statement, the firm said the inquiry "relates to features that make it easier for people to find and connect with friends on our services".