How to delete Facebook contacts on my iPhone ios8?

I woke up one day and I saw multiple contact from facebook. I tried to delete them but my phone don't let me. How can I delete them without deleting my own contacts?

First off, make sure the FB settings in iPhone are set so that you can't link contacts. I think there may have been a glitch for some people because when I updated to iOS8, all my FB contacts (plus FB people I'm no longer friends with) were synced, even though my settings were off for FB contacts. So I wound up having to delete them one by one, check the settings again and restart the phone.

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