The sites were breached via their vendor , Zendesk . It did not name the three customers publicly , but subsequent e-mails from Pinterest , Tumblr and Twitter to their customers confirmed the breach . The photosharing company also warned users about the breach via e - mail on Twitter . The company urged users to ensure their passwords are strong .
The sites were breached via their vendor , Zendesk . The photosharing company also warned users about the breach via e - mail on Twitter . The company urged users to ensure their passwords are strong .