The Facebook today announced the change of terms of use of its services and policy. Under the new terms, it once again legitimizes the tracking of its members' online habits through cookies, stating explicitly that they will use the data they collect for advertising purposes.
This, of course, is not new, but once again the social network makes it clear to everyone who believes in their online rights and privacy. 
The company says:
“Χρησιμοποιώντας τις υπηρεσίες μας, από την 1η Ιανουαρίου και έπειτα, συμφωνείτε με τους όρους χρήσης, την πολιτική δεδομένων και την πολιτική για τα cookies στην τροποποιημένη μορφή τους. Συμφωνείτε ακόμα να βλέπετε βελτιωμένες διαφημίσεις, με βάση τις applications and the websites you use. Learn more about these changes below, as well as how you can control which ads you see.”
All the text you can find here.
How to protect yourself partially
"If you do not want Facebook or other companies to collect and use information based on your activity on sites, devices or applications other than Facebook in order to show you ads, you may choose not to receive such ads from affiliates. companies through Digital Advertising Alliance in the US, of Digital Advertising Alliance of Canada in Canada or her European Interactive Digital Advertising Alliance in Europe. You can also opt out of your mobile device settings. ”
From the webσελίδα of European Interactive Digital Advertising Alliance follow the guide on behavioral advertising and privacy on the Internet. You'll find information on how this ad type works, so-called "cookies", And simple steps to protect your privacy on the Internet. In case you do not find the information you are looking for you can contact the service.
At Manage Options of service (wait until the site loads) you will find some of the companies that collaborate with websites to collect and use your information to provide behavioral advertising.
You can use the buttons to set your preferences. You can enable or disable all companies, or set your preferences for specific companies. Doing click on 
you can find out more about that company as well as whether or not it is enabled on browser that you are using.
5 tips to help you manage your online privacy by European Interactive Digital Advertising Alliance.
 |
Do not panicBehavioral advertising is safe and transparent. Advertisers do not know who you are because the information they collect can not identify you and are based on your Internet browsing to provide you with ads that reflect your interests.Learn more about behavioral advertising. | |
 |
Look for behavioral advertising information on every website you visit.Every website that uses behavioral advertising should have information about the collection and use of data whether it is collected by the website itself or by a third party such as an advertising network. | |
 |
Companies that manage behavioral advertising will still have to provide information on how to opt-out.You can opt out here. | |
 |
Familiarize yourself with the privacy settings on your computer.These settings can be found in the browser's "Options" menu. When choosing cookie settings, remember that they often make websites more user-friendly (eg your site preferences, language settings, passwords, etc.) |
The following example shows how privacy settings are made in Internet Explorer.
 |
Try customizing your privacy settings to suit your household needs.Each of us uses the Internet in a different way and for different purposes. In households where more than one person uses the same computer, we recommend that each user have their own account. In this way, the privacy settings will be adapted to the needs and requirements of each user. |
