Facebook has been offered a deadline to provide even more info on what is carried out with users' data, or it will eventually face sanctions from typical European Commission.
Justice Office Vera Jourova said typically the firm had not served quickly enough after getting told to update their words of service inside February.
She said the woman "patience" had be depleted in addition to threatened to apply fees and penalties.
Facebook, which has to be able to act by 31 January, said completely made several changes and would keep on to co-operate.
Consumer activity
"If we don't notice progress, the sanctions may come, " Ms Jourova told a news conference. "This is very clear. We cannot negotiate for ever, we need to see the results. "
Both Facebook and Airbnb were at first called on in February by the Commission to ensure their conditions of service complied with European regulations. It told them to improve communication with users, so they have full knowledge of what is done with information gathered about them.
In addition, the Commission told Airbnb to let individuals know about the total prices of bookings and extra charges and ensure consumers get enough details about hosts.
Since the call to improve was repeated in July, Airbnb had made the "necessary changes to ensure full transparency", said Ms Jourova. But this willingness to change had not been matched by Facebook.
By contrast, she said, the social network had only made "very limited progress".
Ms Jourova was irked by Facebook characterising its data and content gathering practices in order to enhance the overall user "experience", yet the company did not really highlight the fact that will this information was exchanged to 3rd parties.
Ms Jourova said: "If all of the changes are not fully applied from the finish of the particular year, I call upon consumer authorities to behave quickly and sanction the organization, inch she said.
In answer, Fb said it updated the conditions of service within May to include the particular "vast majority" of modifications proposed by the Commission rate at that point.
"Our conditions are now a lot clearer on what will be and what isn't permitted on Facebook and on the particular options individuals have, inch it said in the statement.
It said this was "grateful" for the particular continuing feedback from your Commission rate and added it might "continue our close co-operation in order to understand any further issues and make appropriate updates".
