The website would be called KnowledgeDump. You type in a keyword and it gives you non-standard info about it. For example, if you typed in banana, you would get stuff like "Bananas are easier to peel from the non-stem side." You would be able to rate the info, or flag it as false. I think it would be pretty cool. If you signed up fro an account, you could submit your own knowledge.
Ideas aren't what make websites popular, it's their implementation. So it doesn't really matter if you 'post them on a forum'... People always get worried over stuff like that needlessly.
Do you guys think Google was the first web crawler?
Do you think Facebook was the first social website?
Do you think Twitter was the first mini-blog site?
These sites all got popular because they were implemented well, not because they were new ideas.
Some issues I can think of with your idea:
1. If anyone can upload 'facts', then how do you control spam?
2. So it's basically a wikipedia, except with mini-facts instead of paragraphs?
3. How do you get enough people to set up a lot of the original information? If people keep going to the site and typing in new stuff they want to know about and it's empty... they probably won't come back.
Anyway, good luck with the idea. Hope it works out for you.