Facebook has blocked plans by an insurer to view young drivers' profiles to set their car insurance premiums.
Were a young driver considered to be low-risk, a discount would be offered.
"Protecting the privacy of the people on Facebook is of utmost importance to us.
We have clear guidelines that prevent information being obtained from Facebook from being used to make decisions about eligibility," said a Facebook spokesman.
"Our understanding is that Admiral will then ask users who sign up to answer questions which will be used to assess their eligibility," Facebook said.
A digital rights group said the move by Facebook should be welcomed as the plan was "intrusive" and "inappropriate".