[Skunkworks] What the...they even know where I am?

Fellow Skunks, I have been playing around with Google+ and noticed that the "Add location" thingy shows exactly where I am...i.e..."Moi Avenue, Nairobi"...For Skunksville's sake...how do they do that...???? I usually thought you can see the general Location if an IP (e.g. Nairobi or Kenya) but if they can see the street where I am, does that mean they know where I am right now...it's kinda scary... Timo.