· When you first sign up, you'll see some 'circles' that have already been set up by Google, including 'Friends' and 'Acquaintances'. You can also add your own.
· You can share messages or links with everyone or with only those within designated circles. This gives you more flexibility than Twitter and is a similar concept to ‘groups’ on Facebook.
· Your circles are private – that is, no one can see how you've named your circles or which circles they or anyone else has been put in.
· 'Sparks' is an area of content based around specific interests, although the topics are often American in focus.
· The 'Notifications' section will let you know when someone adds you to one of their circles (though not which circle) and when someone has commented on or reacted to content that you've shared or commented on.
· You can make comments underneath content shared by other users that you follow, and you can also '+1' it. The latter is similar to ‘liking’ on Facebook.
· You can also share that content, if the original poster allows it. This is similar to ‘retweeting’ on Twitter.
· If the original poster allows it, after you interact with a post, Google+ threads responses and informs you of any updates. If this starts to get annoying, you can ‘mute’ these updates.
· The ‘Hang Out’ application allows users to video chat.
· You can upload and organise photos using Google Photos (previously called Picasa).
· There is a Google + app available for smartphones too.