You need to remember also,
How are you going to make sure that the information posted in a profile is actually going to be about the person that it was intended to be about and not someone else who has the same name in real life, or the same username online, or possibly lives in the same town, city or state, maybe went to the same school or worked at the same place?
It'd be very easy for mix ups to occur.
Just a few years ago, a local pharmacy mixed up my wife's prescription with someone else' prescription cause the other person who lives locally has the exact same first, middle and last name. My wife was the one who caught the mistake when she looked at the label.
As for me, even though this area is more country than it is city, last time I checked, there were over 5 or more people in the local area with the same name as me and that was a few years back. I've tried googling my name and all I come up with is well known doctors, lawyers and others that are well off.