This documentation covers how Google+ Actions work.
Applications that support Google+ actions:
This action incentivizes a user to check out your Google+ page, you can optionally ask the user to +1 or Follow you once they have already visited.
Please note, we do not award any entries for +1's or Follows (as this is against G+ guidelines), they are completely optional on the users part.
To complete the first step that awards the user their action, they simply need to click to get redirected to your Google+ page (where they can absorb all your wonderful content).
That then unlocks the secondary step asking for an optional +1 or Follow, the user is free to completely skip this step if they wish.