A director at the nonprofit Foxglove, which has helped organise a content moderators' campaign over their work conditions, described the move as "outrageous bullying".
Following his appearance, trade union Verdi said Haksöz had been placed on a paid leave of absence pending an internal investigation.
Meta and other social media companies have faced criticism over the working conditions of content moderators who aim to keep their platforms free from harmful material.
In 2020, the firm paid a $52 million settlement to American content moderators suffering long-term mental health issues.
"Cengiz was invited to testify to the German parliament about the dangerous working conditions on social media’s factory floor.
Persons:
Verdi, Cengiz, Haksöz, Cengiz Haksöz, Christoph Schmitz, Schmitz, Martha Dark, Martin Coulter, Hakan Ersen, Hugh Lawson
Organizations:
TELUS International, Digital, TELUS, Facebook, Reuters, Haksöz, Meta, Thomson
Locations:
Germany