Recently Google+ started to allow Google+ page owners with large following to promote their posts.
But the system doesn't work like post promotion on Facebook. Facebook
promotes paid posts to users
within the social network itself.
Google+ on the other hand lets you create Adwords ads of 4 different
sizes from your Google+ posts. With this move Google+ became a vehicle
to make Adwords creation easier for their clients.
See how the system looks like on the included screen shoots. When the
user hovers over these ads the Google+ post appears in full size.
Follow ADVERTISEMENTS on Google+