Does anyone know how to hide my profile from people outside of OH from seeing it?

I feel violated - someone who I did not want to know about my RNY did a search at Yahoo People Search and found out about my whole life that I posted on OH. I tried to change my profile so that only my friends could see it. Then I tried the same search that this person did, and sure enough, I could still go directly to my posted information. I am too afraid to post anything else now because of this. This person knows too much now and is telling everybody about everything he saw on my site. Anyone know how to put a block so someone from the outside can't find my postings???

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