Google indexes links to WhatsApp group invites that may be private, meaning people can find and join them.
Motherboard used a number of specific Google searches to find invite links to WhatsApp groups. Some of the groups appear to not be overly sensitive or for a particular audience. Many of the links on Google lead to groups for sharing porn.
But others appear to be catered to specific groups. Motherboard entered one WhatsApp group chat that described itself as being for NGOs accredited by the United Nations. After joining, Motherboard was able to see a list of all 48 participants and their phone numbers.
Check It Out: Google Search Reveals Private WhatsApp Groups