I did not interview here, but I think similar to an "interview invite thread", perhaps more useful would be an "interview follow-up thread" which might help people better gauge if they actually impressed interviewers or not, and give maybe a little more data to us students when making an ROL.
I'm sure people would lie about their communications under the veil of internet anonymity, but hopefully there would be another member(s) who also received post-interview communication from the same institution and the BS would get weeded out.