Schrems is suing Facebook's Irish division in an Austrian court for various alleged rights violations including tracking of user data and involvement in the US National Security Agency's PRISM surveillance programme.
He had also lodged cases on behalf of seven other Facebook users in Austria, Germany and India.
Facebook had challenged the jurisdiction of the Austrian courts in the case, and argued that Schrems's professional activities on his account meant he was no longer a private consumer.
"However, Schrems cannot rely on his consumer status with respect to claims assigned to him by other consumers."
The EU advocate general's legal opinions are often, but not always, followed by the the ECJ's judges in their final decision.
Austria's Supreme Court had referred the matter to the ECJ after Schrems's lawsuit was first thrown out and then restored by the country's courts.
Facebook welcomed the findings on the collective lawsuit.
Schrems is also suing Ireland's data protection regulator over the transfer of personal information by Facebook from Europe to the United States in a separate case being considered by the ECJ.
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