open-source marketing for companies

time this may take to implement:
weeks
would this be useful to everyone:
not sure, so it would be good to have it as an option only

how important is this for me:
minor importance

detailed description:
The ideas is companies to have the option to add a section for collaboartive markteting - space where customers can offer ideas how to market the product better, point tips how to "sread the word" more; upload banners, animations, etc made by them. Just like in http://www.spreadfirefox.com/ or http://community.wikidot.com/promote . Probably companies can open make this by using the API but it would be easier to have it in some "pre-fabricated" way and then choose whether to have it or not by ticking a box.