Posted a few things on Freecycle recently - not long after message had been posted people responded asking whether item was still free if so when can they collect - you reply given them a time - eg any time after 7pm - then you hear nothinrg more from them and they dont turn up -
OR they respond quickly to an ad asking if still free - you reply and ask when would you like to collect - hear nothing more from them .
Getting slightly pissed by people who quickly fire off a response as soon as ad posted but then never follow it up . 
If you are one of these people please expect the item to be given to someone else !