Facebook browsing habits don't even come close to the level of personal that google searches do. Even hardcore facebook stalker behaviour pales in comparison to some of the questions people ask google.

Anyways, I don't think it's necessarily something people will be alarmed about, I just think it's something that should be made extremely clear because on the off chance people do start to worry, and how fast FUD can travel. It really could kill what looks like a great platform it that happened.