Have you seen someone doing a good or a bad thing for your city? Then take a picture and post it to Twitter using the hashtag #urbanfact (or, in portuguese, #fatourbano).

We'll add it to our site where other people can vote and comment. If we have the geolocation for that tweet, we'll also add it to a map.

Praising the good acts will serve an example for others, whereas by exposing the people who do wrong we hope to discourage them to repeat their acts. 

Credits:

Developed by:
Carlos Duarte do Nascimento (Chester)
Daniel Cukier
Marcos Diez
Vanessa Sabino

Other resources:
The font used for the logo and the good icon are free. The bad icon is a derivative work from the file Evil_red.svg, available at the Wikimedia Commons and licensed under Creative Commons