Are you a business that people are going to want to interact with? Oddly enough, people aren't too keen on liking a Car Dealership (my business), but I have seen other companies get followers.
My favorite example of engagement is a company that does it's troubleshooting through Facebook. If someone has a problem they post it on Facebook, and get it answered right away. Every other company I see has to run some sort of competition, but this company (Schedulicity - I think that's how it's spelled), just had to be a great resource.