Tinder users have been left frustrated after many were unable to log into the dating app because of changes to how Facebook links with the service.
Facebook announced a tightening of access to data for third-party apps on Wednesday, and confirmed that these changes triggered the lockout on Tinder, where users can sign in using their Facebook account.
The dating app can be linked with Facebook to see mutual friends shared with potential matches as well as use Facebook photos on a Tinder profile.
On attempting to log in, many were presented with a message labelled "Facebook Permissions".
It said: "Tinder requires you provide additional Facebook permissions in order to create or use a Tinder account. This information is used to create fuller profiles, verify authenticity and provide support."
Following the on-screen prompts failing to fix the issue, many users took to social media to voice their complaints.
Daniel Sinclair tweeted: "Facebook's API changes just broke Tinder. It throws you into an endless login loop. Bravo to Facebook for being considerate of their only valuable product."
Fellow Twitter user Joe DiNardo said: "@Tinder I'm stuck in some Facebook permissions login loop ... Help!".
In response, the app's official Twitter account confirmed the problem with the message: "A technical issue is preventing users from logging into Tinder. We apologise for the inconvenience and are working to have everyone swiping again soon."
Around three hours later, Tinder confirmed the issue had been resolved but has not commented further on the incident.
Other dating apps that also use Facebook appeared to be unaffected.