"One example: our new tailored suggestions feature, which is based on your recent visits to websites that integrate Twitter button or widgets, is an experiment that we're beginning to roll out to some users in a number of countries," it added.
"We may tailor content for you based on your visits to third-party websites that integrate Twitter buttons or widgets... While we have the widget data, we may use it to tailor content for you, such as suggestions for people to follow on Twitter," it said.
"Tailored content is stored with only your browser cookie ID and is separated from other Widget Data such as page-visit information," it added.
According to the paper, Twitter also offered its users the chance to turn off this feature.
After a maximum of 10 days, Twitter begins the process of deleting or "aggregating widget data, which is usually instantaneous, but in some cases may take up to a week".