I am using FB JS-SDK FB.ui feed to post on Facebook but I am having issue with the picture I am posting. What I need is that the picture should look like the picture in image linked here (rectangular shape might be 84x48).
But when I post the picture it is cropped and appears in square shape (200x200). Its original dimension is 800x400 approx near to the Facebook's images ratio i.e. 1.91:1