The company has acknowledged that it has unearthed a security flaw that allowed some tweets that were initially private to become public after the settings were changed to accounts.
In a statement to address the issue, Twitter said: "We're very sorry this happened and we're conducting a full review to help prevent this from happening again."
The popular app also revealed that anyone who updated the email address linked to their account between November 2014 and January 2019 may possibly have had some of their messages exposed.
However, Twitter managed to correct the flaw on January 14 and has pledged to release even more information once it becomes available.
Meanwhile, a group of British MPs previously accused Facebook of making secret deals to give some developers special access to user data.
The allegation is based on some internal documents that have been published online by a parliamentary committee, with MPs saying that the documents show Facebook had reached secret deals.
Damian Collins, the chair of the committee, wrote on Twitter: "I believe there is considerable public interest in releasing these documents. They raise important questions about how Facebook treats users data, their policies for working with app developers, and how they exercise their dominant position in the social media market. (sic)"