People commenting on my Facebook profile photo?

Ok so out of nowhere my friend liked and commented yesterday on my current profile photo which i uploaded 2 years ago. then my other friends started to like and comment on it. i assume something about the photo has been posted on my wall but i don't see it. and i haven't posted anything for over a year.... show more Ok so out of nowhere my friend liked and commented yesterday on my current profile photo which i uploaded 2 years ago. then my other friends started to like and comment on it. i assume something about the photo has been posted on my wall but i don't see it. and i haven't posted anything for over a year. what could be the reason? this is very weird.
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