CHANGING THE WORLD ONE GIFT AT A TIME
Take a look at the Freecycle network. This covers the UK, right across the USA, Canada and Germany, and their "International" page includes countries across the globe, ranging from Australia and New Zealand to Argentina, Trinidad, the Philippines and Spain [Freecycle operates in over 50 countries at time of updating this page].
Basically Freecycle allows people to give away items to those living near to them (all items advertised have to be *FREE*). There are endless groups within the UK, USA, Canada and Germany, and the UK alone has well over 100 groups. If there isn't an existing group in your area of the world ... then start one, to make it possible for people in your local area to join. Instructions here.
If you're under 18 we'd request that you ask your parents to join Freecycle (rather than you signing up). Freecycle enables making contact with people in your local area, to give things away or receive them, but obviously we don't recommend *any* situation where you yourself meet up with strangers. See the Freecycle FAQ page here [scroll down] for more about the risk/liability factor.
The Freecycle project is however a *wonderful* concept and will potentially make a whole lot of difference to people across the world, particularly those on low-incomes or otherwise disadvantaged. Our congratulations to Deron Beal, of Tucson Arizona, who founded this amazing organization.