Apps which integrate with Facebook’s software were unusable for a while, thanks to a code change.
A range of apps on iPhones and iPads stopped working on Friday, with Facebook admitting it was to blame.
The firm told the BBC that «a code change triggered crashes for some iOS apps» but that the issue was «quickly resolved».
Apps such as Spotify, TikTok, Tinder and Waze were unusable for a few hours.
Angry users took to social media while DownDetector, which monitors net blackouts, reported widespread outages.
A similar issue happened in May, affecting services for part of a day.
Of this latest failure, Facebook said in a statement: «Earlier today, a code change triggered crashes for some iOS apps using the Facebook SDK [software developer kit].
