To the americans here, please understand that socialism is NOT communism. Socialism is regrouping a lot of different things (including the most extreme form of communism) and please do not mix the two together.
"In the terminology of Marx and Engels the words communism and socialism are synonymous. They are alternately applied without any distinction between them. The same was true for the practice of all Marxian groups and sects until 1917. "
http://oll.libertyfund.org/titles/1060#lf0069_label_908
Also, uses of "Liberalism" has been changed even more throughout the history.