How to fix ios7 privacy concerns

So I downloaded ios7, not because I wanted to, but because I was so sick of it showing up in my updates. I just discovered when I went to my notes that some of my contacts who also have iphone somehow had there notes sent to my phone! So now I'm worried that some of my information is being sent to their phones. What is causing this? Is it a glitch or something to do with this dumb icloud thing which I also did not want but was automatically downloaded to my iphone. I don't feel comfortable using my iphone now with things being sent around without my permission. Also I don't like that things I do on my phone somehow end up on facebook! How can I get my privacy back on iphone so I don't feel like everything I do is broadcast to the whole world?

It seems to be more of a synced contacts or settings issue than a privacy problem with iOS 7. Overall, iOS 7 is pretty safe (far better security than iOS 6) and also lets you set per-app settings which insures custom privacy.

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