You may have to login with a different Google accout to create a second site I think. Just created one for Webmaster Serve: https://plus.google.com/b/103352497651173642775/pages/getstarted#
I don't think so, google+ is a beginning platform I think that is the big reason that people dislike to it, otherwise its also good for SEO point of view.Google plus is just helping in getting the higher rank due to google.
Otherwise its a time waste when we compare it to the facebook.
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