A contradiction between which of those two word pairs ;)
Seriously though, if you think of Socialism as a group of ideas across different fields, you find a lot of diversity once you get to the applied level. You can get anarchy (the aforementioned social libertarians and others tend towards anarchism) or totalitarianism. Direct democracy or dictatorship.
Say you accept Marx's characterization of history as a struggle between classes, you are moved to rage by The Communist Manifesto,^ it describes the brutal no-nonsense history of civilization in a way that makes sense. There are lots of directions you can go from there. Obviously marx had some pretty specific applications which I read as leading to something not that far from bolshevism, but you don't have to agree with everything.
^I suggest that you read it. For most people, I suspect you'll quibble with bits and pieces that have since (it's been 150 years, after all) been subject to more trial and scrutiny. As a narrative, it is not without predictive power.