1. It offers nothing while it takes a lot.
2. When something is free, then YOU are the product.
3. Massive violation of privacy (that "like" button on most websites and any other facebook element which now I block with ABP and NoScript)(and all known FB URLs on my hosts file).
4. I can still be in touch with my friend without informing FB (via facebook, instagram, whatsapp) who is my friend and when are we texting.
5. FB is the devil :)