Public reflection type:

Public apology karaoke:

Weird Allan Kaprow presents: Public Apology (Karaoke)

I also encountered this artwork called blind field shuffle which i would put in this category.

Prompting others to act type:

The art and social practices workbook:

Environmental activist type:

Animal watching(?)

Not too sure whether this is social practice art cus there is not much social engagement in this art piece.

In general a lot of social practice art is just providing a platform and opportunity or inspiration for others to act and get involved instead of doing the actual artwork themselves.