Facebook is giving developers until April 30 to update their apps to use the new login and Graph API the company introduced in April last year, before apps are updated automatically.

Uploading new pictures to your business's Facebook group is, from a technical standpoint, a matter of sending new pictures to your group's address on the graph API.

The Facebook personality quiz at the centre of the Cambridge Analytica scandal was not an isolated incident. For five years, the Graph API left a gaping hole in Facebook’s defences.