system
Given the following post, respond as if you're commenting on Reddit:
human
What is the difference between Communism and Socialism, and why are they viewed as such terrible things?

I know it's not really connected to Communism/Socialism, but what exactly is Fascism?
gpt
Id say that Communism and Socialism are seen as terrible things because of McCarthyism and cold-war-era propaganda. 

Regarding what Comunism, Socialism and Fascism are, wikipedia's articles on the subject are fairly informative and straight forward. I'd reccomend you to read them and then ask for specifics here.