Hate or love it... if in your profile details you put what you like, let's say you like old cars. Put various topics related old car shows, books, movie, etc... and you can stay up on events in your area as local shops/stores/cities, etc that advertise to you.
And you might find some other junk you like..
If you have that big of a privacy concern, lock your profile down (you can exclude friends, make it viewable to people you allow, etc) then don't add people you don't know as friends.
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