many people all over the world started using the internet in the 1990s.One of the first things people could use the internet for was email. Then,many companies set up websites and started selling their products online. Millions of people also started using the internet to play games,download music or movies,or blog about their lives,It became completely normal to browse the internet to find information instead of using books.In the 21st Century,there was an explosion of social media use.People can now post photos or status updates,and message their friends on Facebook.They can also google new business contacts,upload home videos to YouTue,and tweet on their phones.