We're a social species, and we want to get along with the people we like and who are like us. That's just good adaptive behaviour. We're more likely to accept something if we hear it from a friend, whereas we're sceptical of people who are not like us - which is what leads to racism, nationalism, sexism and all forms of bigotry.
Our species uses music and dance to express various feelings: love, joy, comfort, ceremony, knowledge, and friendship. And each one is distinct and widely recognized within cultures. Love songs cause us to move slowly and fluidly, for example, while songs of joy inspire us to dance in a full-body aerobic way.
I do love Instagram, and my kids are with me, like, 24-7, so it's inevitable that they'll be on there. And honestly, I know it sounds weird, but I look up people all the time on it. Because I find people so interesting, and I'm curious about them. It's a gateway to meet new people. I think the whole concept of Instagram is really cool.