Nigerian App solves community garbage problem

Discardious App by Nigerian Girls harness community power to tackle garbage problem

This could be a model by which any community can be brought together in teamwork using apps, for the good of all.

Most problems are caused by people being too lazy to do something properly, or something like that.

http://www.htxt.co.za/2015/07/09/nigerian-teen-girls-waste-disposal-app-wins-international-dev-challenge/

This of course depends on the community's awareness of a problem and willingness to solve it. If the app can somehow bring the effort required to solve the problem down to an acceptable level, hundreds of people could participate.