This: Facebook ‘Security’ Phone Number Being Sold To Advertisers – Business Insider
Yep. The phone number they said was security purposes is now being used to target you more effectively for advertisements
You should just assume that any information that you provide Facebook will be used against you. No wonder they are rapidly becoming the next version of MySpace.
Smart People I Know 
Thanks for the info. That is really disheartening.
…The only thing I use FB for anymore is to play Lexulous & to stay in touch with my daughter.