"Is a puzzlement."
I have never managed to work out just how Facebook calculates the number of people any one post has reached. I'm not a great user of F/b but I do try to publicise Brighton Lions Club through the medium. The puzzle comes when one post soars away to hundreds of people reached but the next crawls to fewer than one hundred. A case in point: one day I published a pic of a cheque for £5k being presented to the local hospice: 485 people reached very quickly. The next post publicises a fund-raiser: 85 people reached.
Oh well, never mind. I'm not unhappy in my ignorance, just puzzled.