If socialism is so good, then why don't socialists CLEARLY explain how a socialist society would function?

[Jude the Obscure]

Step 1: Aim to end the wars, save money by leaving some of the 277 nations our military occupies. Use that money to hire unemployed and welfare citizens to jobs.
Step 2: Aim for 100% employment. Ideally, in good economies, most of them will work for private industry, but in these bad times, the government will have to spend tax dollars to hire everyone to a job. The sidewalks, roads, that are cleaned and built (and other types of labor) by those currently sitting on a couch collective welfare or unemployment, will build America's infrastructure.
Step 3: Make the Economy work for the workers. People who labor deserve a break... Up to now, the government only gives breaks to the speculator class and the permanent welfare class. The working poor class shouldn't exist. If you work, you should make enough.

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I think when you say "socialism," you mean specifically Marxism. Socialism was around before Marx. We founded the first Food Co-Ops and Unions before Marx ever set pen to paper. And for those who think Marx was way off in his philosophy, remember that free market America (the mid 19th Century) at that point in history, still had a free market slave trade... very unjust.

Social Democracy, a movement started in England, popular in Germany, Canada and Australia, and at one point fairly popular here in the US, doesn't aim for a Utopia, but rather uses capitalism, and makes the economy just. (not "free market"... but rather a regulated market, fixing the system to make it better)

Free enterprise, but not free trade. A strong safety net so it's nearly impossible to fall through the cracks. That safety net will actually inspire more capitalism, as you can feel more free as an individual to risk opening a business and fail, if you know failure won't mean working at Wal Mart when you're 80 years old.