This is a quick Tip. You follow/circle quite a lot of people and they share messages and posts as time goes. Once the stream of messages and posts come in, the Google+ stream page gets longer and updates itself.
As you start reading posts, you keep scrolling down and let’s say you are way down in the stream. Now if you want to go back to the top, you have scroll back all the way to the top.
But there is a very easier shortcut to get to the top and read the lastest posts.
Just click anywhere on the blank space in the top Google bar, It’ll automatically scroll you back to the top of the Google+ stream, cool huh!