This document discusses theories of identity construction through media and technology. It begins by quoting David Buckingham who said that identity implies both uniqueness and shared attributes with social groups. Collective identity depends on acceptance by those it applies to and is expressed through cultural symbols. Self-identity forms the basis of self-esteem while social identity is constructed by others and may differ from one's own identity. Social identity theory holds that people have multiple identities corresponding to social groups. The document also discusses quotes about identity being fluid and constantly evolving through social interactions and influences from media.