Google + Rules on Running Product Giveaways

[Ben-HPB]

I read in the Google+ Guidelines that running a contest, sweepstakes or other forms of contest is against the rules for Google+

However I have seen a few contests going such as share this with your friends to get entered to win.  How is Google enforcing this rule?

My company runs product giveaways each month on Facebook but I did not know if I would get banned for posting a link to it or building content around it on the Brand Page.

I figured I would ask before I get in trouble. Thx

[EricaMcGillivray]

I'm assuming they're enforcing it when they come across it and feel like enforcing it. But I haven't seen any official documentation. (BTW, Facebook also has rules against giveaways, and as we know, they happen a lot.) Not that I would ever encourage anyone to break the rules...