Jonah Goldberg at National Review has a nice article discussing how in practice, it's difficult to have one without the other.
Most social conservatives - especially those of a religious nature - would likely desire control over their own property. They would tend to believe that individuals should work for a living. They know the value of compassion and exhibit it at the individual level and do not wish their earnings confiscated for causes that conflict with their beliefs.
Conversly, social liberals who describe themselves as "fiscally conservative" over time (according to Goldberg) find it difficult to avoid funding of their pet causes by the state.