[gcampos]

I used to donate them to my local library because I thought they would know best what is worth to keep and what to throw away.

[soul_grafitti]

Did your library know you were donating them or did you just leave them by the door? The polite and ethical thing would be to call and ask if they accept such donations first. If they don't you're saddling them with the cost of disposal instead of paying it yourself.

[gcampos]

I gave them to the staff. They seem happy with the donation and even asked if I wanted to receipt to use for taxes purposes, which I declined.