It's OK to not understand why this is the most interesting thing in the world, but don't complain later that no-one told you.
Letters
Radio
Photo Albums
Movies
TV
Music
Maps
Calendars
Weather forecasts
Shops
News
Encyclopedias
Phonecalls
Pornography
Personal training
Taxis
Hotels
Food
Recruitment
Science
Education
Human interaction
Social clubs
Friends ;)
Banks
Money #Bitcoin