Anyways, here you go: Social constructionism is a sociological theory of knowledge that considers how social phenomena or objects of consciousness develop in social contexts. A social construction (also called a social construct) is a concept or practice that is the construct (or artifact) of a particular group. When we say that something is socially constructed, we are focusing on its dependence on contingent variables of our social selves rather than any inherent quality that it possesses in itself. The underlying assumptions on which social constructionism is typically seen to be based are reality, knowledge, and learning. Google.
Social constructivism is a sociological theory of knowledge that applies the general philosophical constructivism into social settings, wherein groups construct knowledge for one another, collaboratively creating a small culture of shared concepts with shared meanings. When one is immersed within a culture of this sort, one is learning all the time about how to be a part of that culture on many levels. Its origins are largely attributed to Lev Vygotsky. College knowledge. But google would have worked just as well.