Humans didn't invent 'social networks', says a new study into animal behaviour - instead, our use of networks such as Facebook and Twitter actually mirrors group behaviours that can be found in whales, monkeys and dolphins. Intelligent animals 'use' groups to share information with one another - albeit without computers or smartphones - just like humans do online. Experts found evidence of animals forming cliques and gathering information to help make group decisions - in much the same way as humans use Facebook Groups to streamline discussions. The famous 'six degrees of separation' rule - which states that anyone can be related to another person in six steps - also applies to the way animals group with one another. .