Internal Facebook documents, previously seized by Britain, confirm that the tech giant made a habit of sharing user data with other firms without user consent and tried to avoid bad publicity by obfuscating its data vacuuming.
A California court had ordered that the emails be kept secret as part of the ongoing lawsuit against the social network, but Mr Kramer claims he was given no choice when confronted at his London hotel room by Parliament's Serjeant-at-Arms and threatened with imprisonment.
The committee chair, Damian Collins MP, tweeted: "We don't feel we have had straight answers from Facebook. which is why we're releasing the documents".
"Facebook have clearly entered into whitelisting agreements with certain companies, which meant that after the platform changes in 2014/15 they maintained full access to friends data", Collins wrote in an accompanying note.More news: Josh Gordon Delivers Touchdown In Week 13
Facebook, which has described the Six4Three case as baseless, said the released communications are misleading without additional context, but did not elaborate.
A British parliamentary committee accused Facebook on Wednesday of giving companies such as Netflix preferential access to users' data even after it tightened its privacy rules in 2014-15.
Facebook touted itself as championing privacy four years ago when it made a decision to restrict outsider developers' access to data about its users' friends.
Collins also alleged that Facebook took aggressive positions against competitor apps by denying them access to any user data. But the facts are clear: "we've never sold people's data".More news: Chevrolet Silverado HD revealed
"Cambridge Analytica, a political consultancy whose vice president was Republican strategist Steve Bannon, gained access to data on 87 million users in ways that Facebook has said was improper but resembled a common practice at the time among app developers", the Post reports.
The summary of the committee's key issues pertaining to the documents said the documents also show Facebook knew that an update to its Android mobile app phone system - which enabled the Facebook app to collect user call logs - would be controversial. When Twitter launched six-second video clip platform Vine, Zuckerberg approved revoking their access to Facebook's API.
A spokesman for Facebook was unable to immediately comment.More news: 76ers guard Markelle Fultz has nerve injury in neck, shoulder