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 failed to fix the issue, and many took to social media to voice their complaints.
Twitter user Daniel Sinclair said: "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 user Joe DiNardo tweeted: "@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. The dating app has not commented further on the incident.
Other dating apps that also use Facebook appeared to be unaffected.
Announcing the social network's data policy changes, Facebook chief technology officer Mike Schroepfer said the reduction in the amount of data third-party apps could access via Facebook was part of efforts to "better protect" user information.
Among the changes, he said that Facebook will no longer allow apps to ask for access to personal information such as religious or political views, relationship status and details or education and work history.
The incident comes as Tinder announced a multi-million pound partnership with Premier League leaders Manchester City, which saw the app turn its logo blue in reference to the club. It will offer fans exclusive access to games along with events at the Etihad Stadium and other engagements.