The Digital, Culture, Media and Sport Committee wrote that through the use of Onavo, which was billed as a way to give users an extra layer of security, Facebook could “collect app usage data from its customers to assess not only how many people had downloaded apps, but how often they used them”.
The report added: “This knowledge helped them to decide which companies were performing well and therefore gave them invaluable data on possible competitors. They could then acquire those companies, or shut down those they judged to be a threat.”
A graph the committee includes in the report shows an analysis of data collected with Onavo, detailing how commonly apps were used by Facebook owned and rival services.
According to the report, as of November 2013, more than 5,000 apps on Facebook were “whitelisted”, meaning that they could gain special access to user data and the data of those user’s Facebook friends.
Whitelisted companies included ride-hailing app Lyft, Airbnb and Netflix.
An internal email discussed linking a yearly spend of $250,000 on advertising to maintain company access to user Facebook data.
An email from Mr Zuckerberg, sent in October 2012, outlined his scepticism about the risk of data leaks happening between Facebook application developers.
“I think we leak info to developers, but I just can’t think of any instances where that data has leaked from developer to developer and caused a real issue for us,” he wrote.