Yeah there are alot of scammers out there seling the stuff we give away. I agree stick to the well known large charities, charity shops and clothing recycle bins that are springing up in car parks and at your local tip.
I know we're talking about stuff we don't want anymore. But there's something about knowing that your old stuff will be going to someone who needs it as opposed to someone who's going to line his pockets with profit.
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Any fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction.