What is the difference between social theory and sociological theory?

In social psychology, what's the difference between Festinger's social comparison theory and the subjective norm proposed by Ajzen in his theory of planned behaviour?

• Answer:

  According to Festinger's "social comparison theory": "We learn about our own abilities and attitudes by comparing ourselves with other people and their opinions. Mostly, we seek to compare ourselves with someone against whom we believe we should have reasonable similarity, although in the absence of such a benchmark, we will use almost anyone. Upward social comparison occurs where we mostly compare ourselves with people who we deem to be socially better than us in some way. Downward social comparison acts in the opposite direction." Whereas. the subjective norm proposed by Ajzen in planned behavior theory asserts the following: "The best predictors o