Clarifying "Social Facts" in Jurisprudence - Help Needed!

Ye CLAT PG and AILET PG ka koi aur kya hai, jabhi jurisprudence mein social facts ki baat aati hai, to pata nahi kya hua, kya hai. Textbook mein likha jata hai ki social facts theyare not physical facts, but kisi bhi cheez ko social fact kyun mana jata hai, iska koi explanation hi nahin hai. Maine seena ki baat suni hai, kyonki social facts lagbhag hamaare har case mein involve ho jaate hain. Maine suna hai ki kuch log isko "facts about society" kehne ka mauka kehte hain, lekin iska koi clear example bhi nahin hai. Koi meri madad karega?