Of course. Always consider this possibility.
Ever wonder if Faceberg has some kind of technology that is able to read your thoughts by analyzing your eye movements while you look at your phone?
There are things that I have only thought about and never spoken or typed about that are being advertised to me.
But if my usage habits don't change at all? If I look at the same websites every day and don't do any online searches or shopping related to a given thing?
I'm talking about things I have literally only thought about. Even geo-tracking data couldn't point to them.
Well, nothing really is, if you want to get real weird with it.