Google+ has brought new feature to share and disscuss the topics with your circles.You have an intersting topic and want to share,you just paste the link and post it.But now Google+ new feature allows to disscus on that topic.

Just search for your keyword as you would normally do and in the top of the search results you’ll find a new text box saying Join the discussion about “keyword”

Clicking on it and instantly share this topic with your friends or circles