Interesting....I've noticed the exact same thing. I wish I had done a better job of keeping track of my buyers but I feel as if 80% come from Craigslist. FB's messenger results in a lot of time wasters.I've had some items that weren't moving. So I deleted the ad and re listed at a higher price and then sold. Facebook seems to manipulate exposure of ads. I won't get hardley any views and then all of a sudden in one day, I get slammed with inquires.