Facebook  sells ads on Facebook.com that can only be targeted to users based on data they gave Facebook by their “likes” and their profile information.

Facebook Ad Exchange

advertisers will be able to buy ads on Facebook.com and target them using both the same Facebook data described above AND data about users provided by third-party sources  through the Facebook ad exchange .

Facebook may be targeting Google adsense  will get sure success in the long run if it support multiple languages,   in countries like India

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