Interesting, did you know that an original feature on Instagram was confining photos in a square?
I am not too old, mainly lazy.  Originally Instagram only allowed photos to be uploaded in a distinct square shape.
Instagram is a great way to share picture with my family and friends. Do you use it? I do not but I know that Facebook owns it. Ya. That is why you get messages in FB about Instagram. I heard the younger people like Instagram better than FB.
Originally, a distinctive feature of Instagram was its confining of photos to a square; this was changed in August 2015, when an update started allowing users to upload media at full size.