It's important to know the meaning of the words in Portuguese.
"multidão" is the word in portuguese for "crowd".
"doa" is a verb form of the verb "Doar", which means "donate".
Multidoa is an acronym with the words crowd and donate.
The word "doa" is kind of ugly in Portuguese, so it should be smoothed, also not to communicate an imperative idea.
It should bring out the ideia of participative and collaborative projects.
We no longer want interchange between the two last letters "a" and "o". After the valuable work of some designers we found out it's not a good ideia. Please focus on a good font, on nice colors and a nice and MEANINGFUL icon.
http://www.kickstarter.com/ and catarse.me are examples of similar projects.