When I consider using my Facebook account it asks me to allow a lot of my profile and other information - is that necessary?

The information will be used to provide you with more opportunities and make your MindField Online experience more fulfilling. For instance, we will soon be sending surveys based on where you check in or products you might post about. These are exclusive opportunities that will only be given to our Facebook members based on the information they allow us access to. As with all Facebook apps you can remove any information you don't want to share after you link your accounts. You are in complete control of the information through Facebook.