This is a freebie with a twist: the free item isn't for you. When you become a Facebook fan of Cheerios through today, Nov. 5, they'll donate one free book to at-risk kids for every fan, up to 500,000 books. You like cereal, right? And you like literacy? So become a fan already! You can always hide their updates if you don't care to hear about Cheerios' doings.