We've done this a few times, so not too new, except that we have many, many new people since our last one of these. This is rather simple. A person will post, then the next will give their first impression that they had of that person. The next person will post about their first impression on the last person. And so on and so forth. Feel free to either add if your first impression matches or doesn't match that person's personality and whatnot. Since I don't I have a person before me, I shall give the first impression I had on iwaku: "Big, different...probably wont stay for long..."