Zynga’s most popular game, CityVille, is now available at Google +. Google search has a notice just below the Google Search box in the home page, which gives a boost to the access to Google + as those who are familiar with the games in Facebook tend to click the link.
Data from Appdata indicate that 70 million Facebook users play CityVille in Facebook. A similar impact can be expected in Google +. Google hopes that the users who build the Cities in Google+ will build the Goolge + user base as well.