Social media has grown rapidly in recent years. Twitter allows people to post short messages called tweets, which some see as a waste of time but others view as useful for business. YouTube was created by three former PayPal employees and was bought by Google for $1.6 billion. Facebook aims to connect people and share information openly. It has over 500 million active users who spend over 700 billion minutes per month on the site. Canada's most visited websites include Microsoft, Google, Facebook, and Yahoo.