A big secret of Facebook marketing is that it is easy and cheap to drive promotions using ads targeted only at your fans that link to landing tabs that deliver the offer and encourage fans to share to their newsfeed.
A brand on Facebook should be like a casual friend or neighbor and not try to suck people into heavy levels of interaction. What do you do with a friend? Comment on their photos, like their status, vote on their outfit. These types of interactions take seconds, not minutes, and definitely not hours.
A brand on Facebook should offer their users regularly updated, simple to interact with engagement features. Each of the engagement apps should be fully branded, and run in a separate tab with traffic driven from wall posts, newsfeed and Facebook ad units to increase engagement. Start with a personality quiz. Then two weeks later put up a poll. Then try a trivia app. For special events, put up a gifting app for Valentine’s Day, or for the holiday season, a holiday song card.