Social media is a cesspool. I have seriously minimised my use of it over the last few years, twitter can do one and I only remain on FarceBook to keep track of peoples' birthdays, band reasons, and sometimes I do sell stuff there. Must say I've dodged the worst of the craziness/nastiness, but I've had plenty of chancers/lowballers/tyre kickers, the occasional overpayment scammer. It's a mess. The process is exactly the same but none of these people would act like this if it was an ad in the paper and we conducted business over the phone in the old days. It's like people change into entirely different people online, it's like a switch.
Older types like me who remember a pre-(consumer) Internet world and were there at the dawning of it with hope and awe now look on sadly. This is not how it was supposed to turn out