Who are they, "in-game friends"?

[Sakuraluna]

I always thought that it's quite obvious: friends are friends, same for everyone. Though one conversation I had about a year ago made me pay closer attention at whom actually different people would call "friends" or "in-game friends".

I hope that tank found someone else to run content with. That was pretty awful to say about someone who probably did see that person as a friend.