What’s Hot is a column shows ,which quickly shows what has been popular on Google+ throughout the day.
It can be easily accessed by by swiping right of your main “Circles” feed and +1s easily lets you know when a post of yours is popular.
By clicking on +1’d option you can count the underneath +1 for your post.Just share everything with others which brings you close with everyone.
+a’d and What’s Hot both will purely accepted by user. and all are expecting a lot from Google+ now in more.