By now I think almost every internet user knows wikipedia, quite possibly the most useful website there is. I have recently started to look into how I can contribute to this amazing collection of human knowledge, and I was surprised about how difficult this is - there are simply so many articles that are better already than I could ever hope to make them. However, it seems that photographs are still much needed in certain areas, and this is where I started contributing today. My first contribution to wikipedia: (photo, article it appears in).
Consider contributing to wikipedia, it feels really good!