2011 — TripAdvisor: TripAdvisor community members received notification…
Data compromised
Personal information
Technical writeup
TripAdvisor community members received notification that an unauthorized third party had obtained a list of user emails. Passwords and financial information were not exposed. Only a portion of users were affected and TripAdvisor is not sure when the breach occurred. TripAdvisor.com is the world's largest travel related site.
Root cause
Hacking