I recently commented on a Facebook post of a friend and suddenly got messaged by someone who was involved in the post. This person is in fact part of my social circle, however we are not close, we just share friends. This person stated that, one of the person's involved in that post, was a "disgusting pedophile"(this was not out of the blue however, we talked about other subjects before that). I, personally don't know the other person, however when I asked why didn't he go to the police to report, he promptly changed the subject, then, I kept asking on why that person in particular was a pedophile, since this is a concern to me(I have a small sister who could be endangered, since the accused is part of the same social circle), after that, he blocked me. Afterwards when talking with some friends, I learned that on several occasions he has made the same accusations about that person, to different people. Later on, I found out that those two actually don't get along and have a very strong hatred for each other due to political views.
I'm not close to the accuser, and I don't know the accused person. He could in fact, be a pedophile, but, given the lack of evidence and the fact that this person keeps spreading those accusations, could those messages he sent me (and to others) be used as proof of defamation? I'm heavily considering on sending those to the accused, since this feels the right thing to do.