The issues seem to have started around 6:30pm et. Spotify, TikTok, Pinterest, Tinder, and more were affected.

The problem was caused by an apparent problem with a Facebook software development kit (SDK) tool that’s used to power sign-in features for many of the apps. I was n’t able to open a fresh install of Spotify from the app store, for example.

Earlier today, a new release of Facebook included a change that triggered crashes for some users in some apps using the Facebook iOS SDK.’we identified the issue quickly and resolved it. We apologize for any inconvenience’.

A source told the verge that Facebook had rescheduled a server change that triggered its SDK to cause apps using it to crash. A user who appears to be a Facebook engineer said the company had reversed the server side change causing the issue.

The tweets from developer Guilherme Rambo summarize the situation. Rambo also offers a suggestion about what Apple could do to prevent something similar from happening in the future.

Even if you do n’t use Facebook features in an app at all, you’re prevented from using the app because Facebook f-ed up.