WhatsApp has been a really useful messaging system. with its end to end encryption it keeps private messages private. However this is worth checking out if you are a WhatsApp user:Crimewatch have advised that WhatsApp settings have recently changed.
WhatsApp has changed group settings to include "everyone" by default so that people you don't know can add you to a group without you knowing.
This may mean that you might see an increase in spam or phishing messages, loan Sharks, etc. You can change its default settings as follows:
1. Go to WhatsApp:
2. Go into Settings
3. Go to Account
4. Go to Privacy
5. Go to Groups
6. Change from (Everyone) to (My Contacts)