When you join Google+, you will very quickly become familiar with this.
Clicking on it, pulls up a box like the one below.
All good so far. Well, not really. The little box is little and doesn’t do a lot of posts justice. So here is a little tip to help you.
At the top of the box is a link called ‘Google+ notifications.’ Click on that and you will see all of your notifications in your Home stream.