I just went back into my profile and deleted all of my personal/bio info, and made sure my settings were as tight as I could make them. Two older acquaintances

I just went back into my profile and deleted all of my personal/bio info, and made sure my settings were as tight as I could make them. Two older acquaintances were still able to find me, so success. I should also point out that I use it mostly to keep up on family reunions, and classmates, etc. and frequent the site maybe twice a month? And I have always considered it public, so I have posted accordingly. And chided my "friends" to do the same.