An unsupported assertion. If one follows Jesus' teachings and the examples he and his followers set, you'd be a communist. Indeed, this is what the communistic "Liberation Theology" movement is all about.
That is not correct, because Jesus never (to the best of my knowledge) advocated using government force for "acts of charity".
The difference is, socialism is backed by governments threatening force to make citizens behave a certain way. Think taxes and the government programs spawned by uwe of tax money, abolition, slavery, public education, etc.
Jesus just "threatened" denial to the kingdom of heaven.