Australian police said that the counter-terrorism teams raided two homes linked to the mass shooting that killed at least 50 people at two New Zealand mosques last week.
Facebook's Sheryl Sandberg is testifying alongside Twitter's Jack Dorsey.
Facebook shares dropped more than four percent after co-founder Mark Zuckerberg said changes enacted cut time spent on the site by some 50 million hours per day but later regained lost ground.
The EU's General Data Protection Regulation (GDPR) is the biggest overhaul of personal data privacy rules since the birth of the internet.
The move followed criticism by dozens of rights groups demanding the popular social media platform to clarify its content removal policies after it deleted a photograph of the Vietnam war.
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