So what is "Social Constructivism" in real world terms again?
It's the notion that knowledge is "constructed" in the context of the society in which people live. Commonly used to denigrate scientists as people who construct knowledge to advance the agenda of the white male power structure. Or to put it another way, science does not objectively define reality; rather, scientists fudge the answers to serve the existing political and social institutions (yeah right).
Social constructivism is also used to justify the idiotic idea that there is no such thing as a right answer; children smply construct their own knowledge based on their own experiences. Silly stuff but a lot of NEA types love it.
I think this goofiness caught on because it facilitates the giving of degrees to people who cannot master statistics or logic. Keeps the money coming into the university coffers.