Some 87 percent of Facebook's anti-misinformation budget is focused on the US even though the vast majority of its users are elsewhere, 'Facebook Papers' revealed.

Frances Haugen, the former Facebook engineer who leaked a trove of internal documents to international media, is due to speak on the opening night.

Facebook executives say the profits could have been even more if not for Apple updating its iPhone operating system to thwart advertisers targeting users without permission.

Internal documents seem to support the accusations.