On August 1st 2018 Facebook will be disabling access to third party developers (such as Momento) to the Facebook Platform whilst they review each app to ensure it meets their revised guidelines.
This is happening in part with the changes to the platform surrounding the privacy concerns at Facebook that were raised earlier this year.
We have submitted our case to Facebook which is currently pending review. Until our application is reviewed and hopefully accepted the Facebook feed in Momento will cease to update.
This is a temporary issue and we apologise for the inconvenience this may cause. We hope that the Facebook Team will review Momento soon.