Twitter has no warnings published on PrivacySpy. PrivacySpy publishes warnings when it learns a service has announced a data breach or is found misusing user data. If you believe a warning should be published for Twitter, submit one here.
"We may receive information about you from third parties who are not our ad partners, such as others on Twitter, partners who help us evaluate the safety and quality of content on our platform, our corporate affiliates, and other services you link to your Twitter account."
"Our ad partners and affiliates share information with us such as browser cookie IDs, mobile device IDs, hashed email addresses, demographic or interest data, and content viewed or actions taken on a website or app."