It was an advance to fair use, although really here they don't care too much to the legal use of other people's material, lately I tried to use images without copyright free to share and try used my own conclusion after cite sources, and that one of the biggest myths that exist on the internet, which by putting Source already makes it legal and is totally incorrect, I remember the panic that SOPA generated luck that did not happen.
Fair use is a different thing altogether. Fair use means reproducing copyrighted material for the purposes of commentary and criticism. Fair use would not include reproducing the entire work. But it would allow reproducing parts of it to illustrate what is being critiqued or commented on.
Yes, just mentioning the source does not make it legal.
I didn't know that I thought it was the same, it's good to know.