Which language is MySpace/Facebook written in? Facebook is written in PHP, myspace used to be Cold Fusion, but I think it might be in ASP.NET these days. Although it doesn't actually make the blindest bit of difference what language it's written in, they're just tools - think of it as using different colour hammers to hit a nail with - makes no difference as you get the same result. You could use PHP, Ruby, Python., Perl, ASP.NET, ASP Classic, Java whatever...