To me cultural would be more like norms and etiquette of your society
Social would basically include the stuff with the people around you
What’s your contrast between both?
I’m a human geographer (as opposed to a physical geographer, though there’s tons of overlap). In our academic world, “social” has a broader meaning — it includes most anything emerging from contact among human beings (economics, law, politics…). “Cultural” is more restricted. While still embracing a diversity of products of human interaction, it’s focused on the things that make one group (large or small) different from the next — mainly, “superficial” (that is, essentially arbitrary) distinctions like languages, religions, and architectural styles.
I see it the exact opposite of the OP. Cultural is based on specific criteria while social is the the general population.
“Cultural” implies that the whatever-it-is that we’re discussing (values, attitudes, tastes) vary from one culture to another. “Social” includes that but can also mean that whatever-it-is is universal among all known cultures but is nevertheless the way that it is because of it being established as a social norm.
I’m not a professional but I see it JKellyMap’s way. Cultural is a subet of social to me. Social is everything involved in a society, culture being one of those things.
Culture is, in general, the personal manners, art, music, manner of dress and appearance, and other outward customs of superficial behavior that distinguish a group of similar people.
Social = how people interact and relate to each other.
Cultural = the stuff people create and share with each other.
Weird. I was interpreting this very differently: social activities are that subset of cultural activities done in groups. 
Kind of like this. Social is interaction, very dynamic. Cultural is a definition of common practices among people, more an analysis of the society as a whole.
But these are general terms, in a more specific context they are easier to differentiate.