The correct answer to this open question is the following.
If I need to investigate the opinions of people in my school about using social media. the primary and secondary sources that I can use would be the following.
Primary sources.
I would ask my computer teacher and prepare a basic set of questions to ask him about the use of social media.
The other primary source would be the head of the computer laboratory because she has experience in handling social media issues. These could be good primary sources of information because both teachers are experts and have written articles on social media for the school newspaper.
The secondary source I would use would be a good social media news site to check interesting articles. The other source would be a good book on social media in the school library.