Google + aims to double it's user's this year

Google inc aims to double it's user's this year , the new social network if we can say now "new" in a world speed action .

"The growth of Google+ has surpassed any estimates the company had" said Vic Gundotra

Google plus had reached over than 100 million active users , we know that google have a good analytics and statistics options, but who know, the big question i can ask like i'm a specialized person  in new technology ,Mr Google how you can double you're user's ?