Heya, I guess, not everybody here may know about this, but back in 2009, we have a phenomenally successful scavenger hunt called Wikipedia Takes Chennai. THe link in question is : https://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Takes_Chennai
Don't look at the Commons Category, there are only 31 files there.
This event was one of the first of it's kind in India, and was an inspiration to many of us. A quick glance at the talk page reveals a small fraction of what amount of Back end work was done by several of us, including me. We received a lot of FlickR donations as well. A heavy ton of this was uploaded by Srikanth L and Ganesh K. Four were done by me. [YAY!]
Anyway, on this page, we were discussing various things, when GaneshK posted a link to an article on WHY some people don't like contributing to the Commons. I believe this could be of help:
http://www.nytimes.com/2009/07/20/arts/20funny.html Wikipedia May Be a Font of Facts, but It’s a Desert for Photos It is three years old though.