Facebook WILL sell you face to your friends-
Be aware about the anti-social default privacy settings in your profile!
It isn't my own "discovery", I've known first time about this anti-social move of Facebook from this Blog article - "Facebook Using YOUR Face for Ads", and then was happy to read an update on it "Facebook’s Response to Uproar Over Ads". Later I've seen many other people on the web wrote about this sh&tty move of Facebook.
Well, you may want to read the articles from above or just do the following with your Profile:
- Open SETTINGS -> PRIVACY SETTINGS on your Facebook profile.
- Select NEWS FEED AND WALL option.

- Oops- using Firefox? See this step like this? Mee too :(
- There's nothing to do, you’ll have to use a different browser this time.

- Here we are- What a hell !!!

the text is: Facebook occasionally pairs advertisements with relevant social actions from a user's friends to create Facebook Ads. Facebook Ads make advertisements more interesting and more tailored to you and your friends. These respect all privacy rules. You may opt out of appearing in your friends' Facebook Ads below.
- Sh*t, let's turn it OFF! and SAVE the settings!

- ... and wait for the next ANTI- SOCIAL default settings for our profiles from Mr. King of Social Networking FACEBOOK.
Keywords: Facebook, privacy settings, social advertising, social media, social networking, social networks, facebook ads