There is an organization that recycles used hotel soap! What they use it for really restored my faith in humanity.

Instead of ending up at the dump, the soap that you washed your hands with a couple of times is now fighting the spread of disease in impoverished countries.

Every day, nearly a million bars of barely-used hotel soap are thrown away, and that's just in the US and Canada! Derreck Kayongo learned of this waste, and decided to found the Global Soap Project, whic collect used soap from hotels across the United States.

The slightly used soap is now cleaned and reprocessed, instead of ending up in the trash. It is then shipped to lower-income nations such as Swaziland,Uganda, Haiti, andKenya.

(Source)