When the primary questions are not “how many” or “in which order”, but rather “why do you” or “how did you feel when”, it’s probably time to consider conducting qualitative research instead of a quantitative survey. There’s nothing wrong with asking your friends to share their deeply-held opinions with you, but understand that you bear the risk of reinforcing your preconceived notions, because you tend to choose your friends by how much their personality and viewpoints match your own. So, the purpose of qualitative research is to assemble individuals or small groups of people who represent a wider range of personalities and viewpoints and walks of life, so that when you talk about deeply-held opinions, there is a discovery of new insights that you may otherwise have never considered.