Just a quick google search with the first results of FDMB instrucions. Its some meta data shenanigans for faceberg. Here some quoetes from the site.

>Image metadata is text information pertaining to an image file that is embedded into the file or contained in a separate file that is associated with it. Image metadata includes details relevant to the image itself as well as information about its production.

>What is FBMD?

On 2014–11–13, Facebook introduced a new tracking code(metadata in it’s files). It appears as an IPTC Special Instructions metadata field. They look like:

Special Instructions: FBMD01000ac60300004a1d00002d4b000067580000c9650000d5fc000054350100953a0100d3420100e84b01005f8f0100

Special Instructions: FBMD23000969010000b1590000cb7700000a8600000c07010046820100b8c0010052590200e5c902006e440300

More about FBMD:

In this special instruction each string starts with “FBMD”, two hex characters (1 bytes), and a 16-byte (4-character) length. Then comes length+1 sets of 32-bit (8-byte) values.

Its a nothingburger