Create a map where everyone can add markers

[JasperBillemont]

I'm trying to create a simple map/layer where everyone that has the link can add markers to. Is this possible in arcgis online? I've tried making a featured map, setting editing to enabled and having someone add points on it (on some sort of sketch layer) however it does not save when others add things. 

[RussRoberts]

Sketch layers are stored in the map which requires you to save the map to preserve the sketches. You would have to use a feature layer that has public data collection enabled if its a map you are sharing out is set to Everyone.