I have seen several status updates saying that he/she received free FB T-shirt and/or Shoes. This is completely false reporting and the posts are made without the facebook owner’s consent. This is the blackhat marketing technique to promote spam on the facebook.
Such spammers ask your secret facebook email address (looks similar to firstname.lastname@example.org). This email address is used to directly update your facebook status by sending an email to that secret email address. This way spammer posts spam updates on your profile.
If you mistakenly submitted your secret email address to such a spamming engine (examples http://d.fbgoodies.info/, etc). Follow the below steps to change your secret email address.
Go to http://www.facebook.com/mobile/
Find “Upload via Email”, in that column click on “Find out more”
Click on “refresh your upload email.”
your new secret email address will be generated and keep it secure and never share it with anyone.