This is another casual but useful question, as it can tell you both about a candidate's personal interests and how they perceive marketing content on social media. The best answers go further than which companies a candidate likes buying from -- they indicate why he or she trusts certain companies, what about their content strategy appeals to the candidate, and what specifically about those companies the candidate looks up to (and maybe wants to emulate in their own work).

If you need a candidate to elaborate, follow up by asking them to describe a post from a brand they like or follow, and what made that post so memorable to them.