For every one 'genuine' Freecycler - there are at least ten crazies out there.
I gave away a roll of carpet on Freecycle once. I gave it to the first guy who responded, and he collected that evening. Great, very pleased, no problems there.
However, there were no less than 56 other disappointed individuals who also wanted the carpet, and many of them were very experessive in varying degrees, venting their anger / disappointment / sob stories of abject poverty on me for several weeks after the carpet had gone...
Several people begged me to take the carpet back from the first bloke, and give it to them instead (some offering cash!).
Others demanded that I gave them the details of the bloke who had collected the carpet in the first place, so they could pursue him with similar bribes / threats.
One bloke sent me lengthy sob stories for several weeks, all of which ended in "..his poor helpless babies crawling around on bleeding knees, full of splinters from the cold bare wooden floor."
FFS! IT was only a bit of bloody carpet!