Chrome: Google has released two official Google+ extensions: one for Chrome allowing you to quickly share links and get notifications while browsing, and one offering YouTube integration for your Google+ profile.You'll have to download both extensions to get the full experience, with one of them adding a +1 button so you can quickly share pages to your circles, and the other operating as a notification centre. In the same post, Google highlights a new feature for Google+ as well, where YouTube search exists directly inside Google+ via a slider on the right side of the screen. You'll be able to search and share playlists directly from your Google+ profile. You can find more information and download links on the official post.
Shipping the Google in Google+ [The Official Google Blog]