I presume somebody has hacked into facebook and then publicly released their code. The content, or some of it, can be found here: http://facebooksecrets.blogspot.com/ Read the comments afterwards to see how meaningful this really is. Apparently Facebook are not too happy and have issued a number of cease or desist legal notices.
pointless really, there are so many social network codes available that do the same - taking this will only cause you trouble later on
It is logical to think that a <BR> code is simply a "break code" and how can anyone copyright it? They cannot. Think of the coding that creates websites much like the sheet music that creates a melody. In music, a writer takes musical notes that are common to all music and puts these musical notes together in a manner to create a unique and original melody. The same "coding" or musical notes are used by all musicians and songwriters so that anyone playing the music will hear or play the same melody. It is a standard set of musical bars, musical notes, time-beats, etc., that is common to write sheet music. Now, when a musician/songwriter creates a new melody (using this common language), the combination of these musical notes, bars, time-beats, etc. is original and unique to that songwriter. His creation is protected by copyright. Now apply this theory to website coding (or software creation, etc.): The coding is a standard language. To apply a break code you must implement a <BR>. So, when you take all of the various standard codes (of programming languages) necessary for creating a website and put them together in an original and unique manner, the pattern / use / creation of that HTML, XHTML, CSS, etc., is protected by copyright. However, since there are only limited numbers of ways to create certain effects on a website using coding, the reproduction of the basic standard of language creates a commonality that limits original creativity and claims of copyright. Source: RightsForArtists.com