Faces of Open Source is ran by a photographer named Peter Adams. Peter coordinates with the subject of his photos (for example Linus Torvalds) and asks if they want to be a part of his photo project. Since Linus Torvalds doesn't mind the term Open Source he is happy to participate in this project. Since Richard Stallman does not like the term Open Source he would or has more than likely declined to be a part of this project.