Because this is a private server filename rather than a public topic, there isn't a "text" or article about it in the traditional sense. However, you can use the ID to find the source:
: This middle string is the Facebook Photo ID . It is a unique identifier assigned by Facebook's servers to that specific upload.
: Usually refers to the ID of the user or page that originally uploaded the image.
: Typically represents a unique ID for the specific photo instance.