Facebook introduced Open Graph in 2010, which allows websites to integrate with Facebook users' social profiles and connections. This enables personalized recommendations and content based on a user's interests and what their friends engage with. While this provides benefits for marketing and ecommerce, it also represents a risk as Facebook gains more access to personal data and control over consumer preferences. Open Graph uses plugins like "Like" buttons, comments, and activity feeds to socialize the web experience and drive engagement across different websites.