Simple. I start by posting Did you know... and I end it with something like an unusual fact. Then, the next person says "yes" or "no" followed by their own Did you know...
Yes, and that was exactly what I would have posted next, 'cause Mooooooo's last post brought to my mind "a waste of time". For most people, however, it's got to be quite a bit less than that, perhaps 1.7/6, since, after an age, we tend to sleep (a lot) less than 8 hours.
Did you know... that according to suicide statistics, Monday is the favored day for self-destruction?
No, and I don't think we shouldn't say that aloud. Hush !
Did you know... that in the early days of the telephone, operators would pick up a call and use the phrase, "Well, are you there?"? It wasn't until 1895 that someone suggested answering the phone with the phrase "number please?".