A crash course in changing the world.
In Evoke 2 it should be opened a mission every week. This time you could read all missions at the beginning. I think this would be more exciting and motivating.
There are so many problems which have to be solved. For example how can you help people in countries with political turmoil?
How can you convince people to do something voluntary?
Improvements: I think there are a lot of opportunities to improve the system. For example why should i log my evidence again when i sent my blog post or photos.
Another one is to connect people who wrote about the same project. There are so many posts. You can't read everything. The system should suggest some posts which could be interesting for you. Also to suggest some posts which haven't been read by someone.