The Social Identity Theory
in that link is a view that comes close to buddhism.
Your identity is your self or a projected image of self (parikalpita
in the yogachara view), which arises based on your existent social situation or your situation in life (paratantra
, dependent nature). That is to say: "I am european (or from an other continent), my profession is this or that, my age group is between 50 and 60 years (for example), my salary is between X and Y per annum, my language group belongs to indo-european languages, I practice martial arts, scubadiving and other sports, etc..."
These are all different bases of identity, bases of self.
means that you belong to a larger group of human individuals, a larger entity consisting of human individuals.
Your identity as such and such is dependent on larger groups of likeminded or in some respect similar human beings.
The situation in the present day world is that these larger entities speak out
as existent beings. They have power and influence because they have a given number of adherents.
Larger entities of humans existed already at the time of Buddha. There were the four castes,
the four divisions of Sangha
and other Non-brahmin groups of ascetics and their lay followers. These institutions, based on profession, birth or faith, represented the common interests of their members, they spoke out and acted on the behalf of their members.
Karma is action of body, speech or mind.