To fill in the blanks in your question, the correct answers would be:
People in the same culture often share similar values and ideas. These values and ideas are transmitted, or shared, through media, or pieces of information meant to be viewed by large numbers of people. By analyzing these pieces of information, we can learn about the shared values of a group of people.
So the completed statement would read:
People in the same culture often share similar values and ideas. These values and ideas are transmitted, or shared, through media, or pieces of information meant to be viewed by large numbers of people. By analyzing these pieces of information, we can learn about the shared values of a group of people.