Published: Nov 11, 2013 4:46 PM EST
Updated: Nov 11, 2013 5:10 PM EST

FORT MYERS, Fla. - You posted your family photos to treasure those memories forever. But a lot of online companies will be getting some treasure, thanks to your photos.

Starting Monday, Google is selling your photos and recommendations to advertisers. Of course, you won't see a dime.

Google calls it Shared Endorsements. The posts, reviews and photos from the more than 300 million people who use the social media site Google+ will be used in advertisements.

Here's how it works: let's say you're searching Google for restaurant options when you find the photos and reviews your friends left for a new place down the road.

Is this brilliant marketing? Or an invasion of your privacy?

Google is taking the bet that your friends are the most effective pitchmen.

If this bothers you, it's easy to opt out. Go to the settings page of your Google+ account and edit the section that says "shared endorsements."