Surveys as a Way of Avoiding Ethical Issues?

My research proposal involves two parts. I want to gain an understanding of how librarians in the TPL view Facebook and whether they use it to reach out to young adults. I also want to see how young adults use Facebook and how they view the library and whether Facebook should be used as an outreach tool. Ideally, I would like to be doing interviews with both sets of subjects. However, interviewing minors poses an ethical risk. Therefore, I plan to do survey research in Toronto highschools. I see survey research as being less invasive and I hope to avoid any ethical dilemmas by using this method as opposed to interviews.