The recent updated Google’s navigation bar came with a new feature. Now this navigation bar has a Google+ share box. This navigation bar is common on all the Google products. So you can share on Google+ from any of the service of Google.
Google was keep on changing its navigation bar from past few months. Now the final version which is live has a sharing box on Google home page.
If you are logged in into Google account, then you will see your profile pic on the top right corner with a share box. But the share box is put in the manner that it is less noticeable. If you click on the small share text box, it will pop as a Google+ share box. As you can see in the snapshot. Now share anything which you want.
