In the sense that we, as individuals should behave justly, perhaps. "Social Justice" however, has come to mean the forcable redistribution of wealth. Maybe the FR New Testament scholars can tell us if Jesus preached that.
Not perhaps. Read the Beatitudes, or any of Jesus’ sermons. There is no doubt that Christians have both individual and collective responsiblities to the poor, the weak, the despised, the sick, and the out of favor. I can’t have an individual relationship with Christ and ignore what he says about how I need to live my life.
Christ doesn’t ask us to have others forcibly redistribute of our wealth-he expects us to do it willingly and with joy!