Facism and Communism are similar because have Authoritarianism in common. However on the economic scale, they are vastly different. See this representation of politics.
http://www.penceland.com/images/MyPoliticalCompass.jpg (not my picture btw)
Authoritarian Left = Stalin-style Communism
Authoritarian Right = Hitler-style Facism
I am not sure about the lower two. I know that the bottom left includes Nelson Mandela and the Dalai Lama. I would believe the bottom right would be similar to anarchy.
EDIT: There's actually a test you can do on this to find out where you stand on the political compass, lol.
Link here:
The Political Compass - Test