http://daringfireball.net/linked/2010/02/11/facebook-login "it’s a fascinating glimpse at just how confused many people are about how web sites and browsers work. They don’t use bookmarks, they don’t type “facebook.com” in the location field. They just Google for whatever they’re looking for and assume the first result is correct. All this argument over whether the iPad is too simple — if anything it’s probably still too complex."
Not necessarily. There are many other possibilities. For example, maybe they like their 2nd choice just as much and that person has another offer to decide on in less than a week.