What'sApp has changed its group settings to include ''everyone'' by default so people you don't know can add you to a group without you knowing. These people may include scam messagers, loan sharks, etc.
You can change your default settings as follows:
1 Go to What'sApp - at the top of your screen the 3 dots
2 Go into Settings
3 Go to Account
4 Go to Privacy
5 Go to Groups
6 Change from Everyone to My Contacts
