After visiting a question I had posted on this site a few months back, I had noticed something strange with this site.
In the bottom right corner appeared a black rectangle (respecting the general design of the site), that said "Chat with an expert".
I opened it up out of curiosity, and connected with the "expert" itself: just as I had expected, it was a bot.
What was exactly going on?
Wild guess: is Stackoverflow at it again? (As in, doing some tests with various AI algorithms, which had already happened before.)