The difference between a vision and a blueprint in the amount of detail involved. Such a distinction is necessarily vague.
Almost everybody here favors socialism, perhaps except David S. who hangs out here for his amusement. I don't think that many of us have exactly the same idea of what socialism entails on a blueprint level.
If we started talking about blueprints -- even among us socialists -- we would end up in endless arguements. Just recall the long, fruitless dialogues about the merits of market socialism.
People can dream of going to Hollywood to be in the movies without seeing the scripts before they depart to realize their dream.
Saying you're "for socialism" in this context sounds more than a a little like a wish that people should just be nicer to each other. It has almost no substantive content. And at the risk of alienating the True Leninists(TM) here, the Soviet model has almost no appeal to a significant population anywhere aside from Russian pensioners. I sure don't have the answers, but I do recognize that this is a problem.
Doug