She said, "Facebook fully recognises the level of public and Parliamentary interest in these issues and support your belief that these issues must be addressed at the most senior levels of the company by those in an authoritative position".
The firm's chief privacy officer Erin Egan said most of the changes being announced were already planned, but that recent events "underscore" their importance.
Zuckerberg's refusal to come to London is his third time refusing to appear in the Commons.
Zuckerberg has apologized for the massive breach of trust, which saw the data of more than 50 million Facebook users improperly used by the British political consultancy during the 2016 United States presidential election, according to a whistleblower.
Cambridge Analytica one of its clients a political consultancy firm has been accused of profiling over 220 million American voters with data from Facebook in the U.S. elections.
The tech company's stocks dropped 4.5 per cent overnight and have plunged by more than 16 per cent in the last two weeks. The changes are meant to "better spell out what data we collect and how we use it", Egan and Beringer wrote, adding that this is "about transparency - not about gaining new rights to collect, use, or share data".
A year later, the social media giant rolled out new privacy controls and blocked outside parties from seeing personal information.
Synced Contacts to turn this setting on or off.
Facebook's move comes as authorities around the globe investigate how Facebook handles and shares private data, and with its shares having tumbled more than 15 percent, wiping out tens of billions in market value.
Insiders say the number of users affected will probably get larger.
Facebook CEO Mark Zuckerberg is likely to testify before lawmakers on Capitol Hill, according to a source familiar with the matter, with the timing and other details will be worked out later. Cambridge Analytica said it had not shared any of the Facebook profile data with AggregateIQ.
Facebook has apologized for the misappropriation of data and vowed to fix the problem.
How is Facebook preparing for the 2018 Congressional election?