The app, which provides a nostalgia service by resurfacing old photos and posts by connecting to your social media profiles, said it’s cloud computing environment was hacked and the usernames, email addresses and the phone numbers of some 4.7 million accounts were taken.
In addition to user details being stolen access tokens that allow the Timehop app to communicate with your social media accounts have also been accessed. This means the intruders can now potentially post & read your Facebook, Twitter and other connected accounts at their will.
Source: Timehop data breach impacts 21 million users – Security – iTnews