Socialism
This should help answer your question :) http://forum.ea.com/eaforum/posts/list/9387348.page
Forum Discussion
I'm not sure if things have changed, but I was able to achieve 5 stars on socialism without having any friends. I just visited the Other Springfield every day and eventually reached 5 stars. Since that time I have added some friends (16 actual people) and my 5 star rating has maintained.
