"Categories of Third Parties the Data May Be Disclosed To: (1) Other Users (including instructors and students, depending on the Services you interact with); (2) Affiliated Companies; (3) Technology Systems Service Providers; ... (7) Third-Party Business Partners (unaffiliated parties that are joint marketing partners or whose products or services are bundled with our Services); ... (12) Other service providers who use your data solely to provide services to us or to you"
Busuu discloses user data to a wide range of third parties including affiliated companies, joint marketing partners, and various service providers, giving users limited practical control over where their data ends up.