I have just tested it with the following procedure: - Extract some text from a facebook post. - Put that text in a file (resulting size 1869 bytes) - Encode a message of 8 bytes on it. Resulting output file size of 1956 bytes. - Copy the output to a new FB post. - Extract the text from the new FB post. - Found that FB removes all added whitespace and the size of the copied text is exactly the initial one: 1869 bytes

So I cannot use it :D