How is the model of microeconomic supply and demand different from the model of aggregate supply and aggregate demand?

Aggregate supply and demand pertains to how groups of people do business. On the order of Adam Smith's, "Wealth of Nations". Or macroeconomics. Microeconomics usually deal with individual entrepreneurs or small groups of individuals so is business on a much smaller scale.  

It's if you can't see their account. much like a twitter block, they might tell you.

Robber, police man/ woman interrogator, detective(s), witnesses