This question already has an answer here:
A friend of mine posts on Facebook multiple times a day every day. I made a comment and we had a conversation on one post a few months ago. I almost never comment or interact with this person.
How do I find the conversation we had? Is there a way to search for interactions between two people on one of their posts?
(I wish FB would allow you to just query their DB if its public info. At least query your own activity if nothing else.)