So after giving it some thought and doing some additional research it looks like they are building a superdetailed graph based on your relations, textual conten

So after giving it some thought and doing some additional research it looks like they are building a superdetailed graph based on your relations, textual content etc. etc., try and determine and geocode locations based on the analyzed data and then plot those locations through Google Maps. It looks like it is even smart enough to go through your followers, determine the kind of relationship you have with that particular person, and if you and the other person are closely related enough pick certain locations up from their timeline and share those locations between your profile and that of the other person (something which supposedly has happened to a friend of mine given the returned data.) Anyway, not scary at all, nope. </sarcasm>