Google plus (google+) is currently in field testing phase so not everyone is able to dive in and test the social networking app by Google.
However, google is providing an opportunity fo the users to have an interactive tour of Google plus.
The interactive google plus tour shows some of the features of Google+ and how does it feel to be inside the login screen for google plus.
Although the interactive tour is just a demonstrator of very small percentage of features and functionality of Google+ , it still gives some idea about the simplicity and awesomeness of the social network Google+.
You can get the interactive tour of Google+ by going to Google.com/+ and clicking on interactive tour link or directly by Clicking here:
Google plus interactive tour (link not working: https://www.google.com/intl/en_uk/+/demo ).