Another forum I used to frequent (vintage BMX), used to have a PIF forum. It was a sub forum of the main for sale forum.

The idea was simple. You listed something for free (just charge for shipping, or don't), and someone claims it. It was a great was of getting those "not worth selling" items into the hands of people that could use it. Instead of it continuing to take up space in your drawer.

Of course, the person who claims an item is expected to then list an item in return…

Pay it forward!