Thinking of BCC in context of Facebook (and Farmville), maybe a better than usual (pages/sharing) approach would be to create a Facebook game of bingo (eg. one

Thinking of BCC in context of Facebook (and Farmville), maybe a better than usual (pages/sharing) approach would be to create a Facebook game of bingo (eg. one person "creates" the cards, invites friends, and they all play online somehow ..), which you could then tie in with the real BCC ("wanna play with your friends IRL?"). Especially if many of your target users are of the type that's probably using Facebook for casual gaming ala Farmville. OTOH, building this is quite an upfront cost. Maybe you've already considered approach like this (and decided it wouldn't work for some reason). But in general, I've a feeling that grabbing people's attention on Facebook is via some other interaction (e.g. tie-in games/apps) that just pages/groups/link sharing. Hopefully that would also be measurable (how many people tried the game/app on FB, vs. how many people actually clicked on the real thing and bought it afterwards). It'd be interesting to find out if someone has already done something similar on Facebook.