Tips to minimize the privacy risk when using social media:
- Use a strong password.
- Keep a strong antivirus and spyware protection on your computer.
- Check privacy settings.
- Provide basic information that is necessary to open an account. As you can always provide more information to the site but you can't always remove it once it gets posted.
If you think your privacy has been invade by an individual that has revealed your personal information without your permission you can ask them to remove it from the site. If they don't act you contact the site itself to have it removed or seek legal advice.
Caution, common sense and scepticism are your best tools to protect your privacy using social media accounts.