The question is why?
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people like to know how their ex's are doing without them. People love the thought of their ex not being able to live without them once they break up and after day's, months and even years past that thought is still in the back of their head even though they might not think it is.
I have personally caught myself randomly creeping my ex's Facebook and clueing into it wondering "what the heck am I doing?" it's a normal thing, everyone does it and it can't be helped.