Answer:
Prior to smartphones, people used this to record their lives.
What goes up and down without moving?
What has been around for millions of years but is never more than a month old?
Mostly worn by women or girls, this is sometimes shiny like silver or gold, and sometimes it is made of pearls.
What is part of you and all around you but if it entangles you, it will kill you?
I can be found in water but never wet