Libervis have an article about the Free Software Foundation's position of not recommending but still using Debian. Interesting.
Read it here
The Free Software Foundation has an official list of Free GNU/Linux distributions. That is, distros that dont include any non-free software in the mainline distribution image or package repositories. With that in mind, the said list is quite selective. The names of the distributions are as follows:
Something that I found peculiar was that the distributions Debian and Gentoo both have a social contract that ensures the freedom of the distribution. Debian explicitly states on numerous occasions that the system will never require the use of a component that is non-free.
Now, for the interesting part. By performing a simple Netcraft check, we can see the FSF servers running what GNU/Linux distro? Debian, of course! If the concept hasnt violated your cortex just yet, I must remind you of this double standard of distribution selection. While Debian remains a free distro in its default substance, the official package repositories include a section with a raft of non-free software in it.