For example, someone only gets logged in automatically if she/he is a contact of yours in Outlook, Outlook.com/Hotmail, Skype, or Facebook. If you remove someone from your contacts, she/he cannot connect.
You can also choose which of the above services to pull contacts from by performing the procedure below:
- Go to Network & Internet>>Wi-Fi>>Manage Wi-Fi Settings (only available on computers that support Wi-Fi).
- Uncheck the services you do not want to allow under "For networks I select, share them with my contacts."