On contrary Google Calendar is very useful when it comes to public institutions like Library to advertise their upcoming events. I have seen it in many websites like galleries, concerts hall, museums ect.. and it's a great way to interact with others,
simply you can view a list of upcoming meets exactly as if it were a printed meet sheet - works brilliant! It's also very easy use!
When it comes to private use I'm very sceptic. I find it utterly stupid that people display their lives online, they don't realise how easy it is to find out what they do, where they live, whats their name and even phone number... Anyone can see your calendar when you choose to keep it "public". I just wanted to indicated that too many information might lead other people for example to your house that could get robbed. So be smarter about what you share online. If given a choice, mark the calendar private or share it with specific people, not Globe. If you don't know how to privatize your Google Calendar - login to Google Calendar, click on Manage Calendars, find the Calendar you want to edit from your list and click "Shared: Manage Setting" - "Don't share with everyone". I'm going to stick to my old fashioned small pink diary (choose of the colour thanks to Amazon ;) !!)