They both set cookies. They can personally identify you all they want; though Google seems to promise you need to opt-in first. You (and possibly your users) need to review the relevant privacy policies.
When you click Like on a company's Facebook Page, ad or products:
- You create a connection to that company and you'll receive updates from it in your News Feed.
- The story of your connection will appear on your Wall.
- Your friends may also see the story of your liking the company in their News Feeds. You can always review and manage your likes, activities and connections by editing your profile. To learn more about the Like button, visit our Help Center FAQs.
If you like a company and that company runs an ad on Facebook, we may pair your name and profile picture with the ad when your friends see that ad, in a News Feed-style story. This social context makes the ad more relevant to you and your friends.
Learn More -
http://www.facebook.com/privacy/explanation.phpWe may institute programs with advertising partners and other websites in which they share information with us:
- We may ask advertisers to tell us how our users responded to the ads we showed them (and for comparison purposes, how other users who didn’t see the ads acted on their site). This data sharing, commonly known as “conversion tracking,” helps us measure our advertising effectiveness and improve the quality of the advertisements you see.
- We may receive information about whether or not you’ve seen or interacted with certain ads on other sites in order to measure the effectiveness of those ads.
If in any of these cases we receive data that we do not already have, we will “anonymize” it within 180 days, meaning we will stop associating the information with any particular user. If we institute these programs, we will only use the information in the ways we explain in the “How We Use Your Information” section below.
-
http://www.facebook.com/policy.phpMy reading of that is that you are not anonymous until 6 months have passed: by which time you may have visited the page in question again, resetting the timer.
... When providing ads tailored to your interests, we offer useful tools for you to view and manage the information that is being collected and used to serve ads. To protect your privacy, we follow three principles when we serve ads:
- Transparency – We provide detailed information about our advertising policies and practices.
- Choice – We offer innovative ways to view, manage and opt out of advertising cookies and other anonymous IDs.
- No personally identifying information – We don’t collect or serve ads based on personally identifying information without your permission.
-
http://www.google.com/intl/en/privacy/ads/... How we use the DoubleClick cookie information
We use the advertising cookie information collected on AdSense partner sites and certain Google sites to:
- Enable the following ad serving features:
= Frequency Capping: Prevents users from seeing the same ad over and over again;
= Spam Filtration: Uses cookies as one of many signals that allow us to identify invalid clicks (or ad queries) and to protect our advertisers from fraudulent behavior;
= View-Through Conversions: Provides insight to advertisers on how many people who were exposed to an ad, didn’t click, but subsequently visited the advertiser’s website;
= Interest-Based Advertising: Allows advertisers (including Google) to serve ads to users on AdSense partner sites and certain Google services based on online activity and interests associated with the DoubleClick cookie and to serve subsequent ads to you after you leave that advertiser’s website.
- Audit, research, and analyze the data in order to maintain, protect, and improve our services;
- Ensure that our ad-serving technologies function properly; and
- Develop new services.
The advertising cookie information described above is provided to advertisers and publishers who use our advertising services. In addition, Google or our advertising and publishing customers may use web beacons in conjunction with the DoubleClick cookie to collect information about your visit to the website and exposure to a particular advertisement.
-
http://www.google.com/intl/en/privacy/ads/privacy-policy.htmlThey go on to say that they don't use your personally identifying information without your consent, but I fail to see how information about your interests is
not personally identifying.
If I am more knowledgeable about these things than the average person, it it probably because I have a bad habit of reading fine-print. That is one of the major reasons I am interested in bitcoin: on the surface, less onerous "Terms of use" to follow. Though, some of the onerous terms in Credit Card agreements seem to stem from anti-money laundering and terrorist financing laws.