Twitter announced the news in a blog post.
"If you live outside the United States, our services are now provided to you by Twitter International Company, our company based in Dublin, Ireland.
"Twitter International Company will be responsible for handling your account information under Irish privacy and data protection law, which is based on the European Union’s Data Protection Directive," Twitter wrote.
The update also outlines how users' information can be used on the platform, and covers Twitter services including Digits and Periscope.
With over three quarters of Twitter users now residing outside the US, the changes will impact hundred of millions of account holders, including those in Australia and New Zealand.
The changes will come into effect on May 18 this year. To find out more visit support.twitter.com.