It's not as radical a change as the introduction of a cloud storage service or selling unlocked Nexus phones on the Play Store, but the Google news train keeps on rolling today with the announcement of a new Share button for Google+. You'll start seeing the red and white icon attached to various articles around the web, and clicking it will give you the option of posting the article to Google's social network and who to share it with. Once you've shared, the colors will invert from red-on-white to white-on-red like the old +1 button. If you'd like to add the button to your own site, you can get the code from Google Developers, and site owners using the button already will be automatically upgraded to the new one.