facelight - FAQs
I am not able to invite all my Facebook friends to this site. There is a limit on the number of Facebook friends that I am able to invite at one time. Why is this so?

The Facebook Friends Invitation limit is based upon your historical invitation acceptance rate. So, we do not have any control over this. This is a dynamic limit that is set by Facebook. The number of invitations per application will be based on the rate at which users accept and ignore your requests. Essentially, different people see different limits.