Sell t-shirts and mugs with some of the more popular facts. Github was able to sell out of tees and mugs with just their logo on it, so I imagine people would want them with interesting content rather than just a logo.

Additionally (or alternatively) you could create a fmylife.com equivalent for your facts. Even if you don't let users submit content, it's a place where the community can vote on their favorite bits of info. Doesn't even need tons of ads, and you can take private advertising and make sure they are all in good taste for your audience.