Wondering how you can run a contest on Google Plus? You can’t! It’s true – check out Google’s policies on contests.
Not only is there no means to run a contest and record entries on the Google Plus platform, it is against the rules to use any functionality of Google+ as a means of entry. In other words, asking people to “+1″ in order to enter to win is against the rules.
If Google+ Contests Were Not Against the Rules
Even if contests were permitted on Google+, there would be the matter of keeping track of entries. Unlike Facebook, with its tabs or applications, all you have on Google+ are your page and your +1s. There are paid services that claim to track who +1s each page on your website. However, according to Google+, this also violates the rules pertaining to +1 buttons.
“Publishers may not attempt to discover the identity of a Google+ button user unless the user consents to share his or her identity with the Publisher via a Google-approved authorization procedure. This prohibition …