My favorite song of all time is probably I'm Like A Bird - Nelly Furtado.
I don't even like nelly but that song>>>>>>>>
As for the greatest song of all time...I don't think that's possible to determine. Everyone has their own personal taste and faves. You can't just name ONE single song the best..
It's interesting that you chose to respond to that and not equally ridiculous--but actually serious--answers like songs by Beyonce, Avril Lavigne and Lady GaGa.
I didn't look at the previous pages and that was the first one that I saw.