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 Facebook is famous for several reasons: Social Networking: Facebook is a social networking site that allows people to connect with friends, family, and acquaintances. It provides a platform to share photos, videos, messages, and updates with one's network. Easy to Use: Facebook's user interface is intuitive and user-friendly, making it easy for anyone to use the site. Users can quickly create a profile, upload pictures, and start connecting with others. Large User Base: With over 2.9 billion monthly active users, Facebook has a massive user base, making it a great platform for social networking. Advertising: Facebook has a robust advertising platform that allows businesses to target their ads to specific demographics and interests, making it a powerful marketing tool. Groups and Pages: Facebook also allows users to create and join groups and pages, which cater to specific interests, making it easy for people to connect with like-minded individuals. Mobile App: Facebook's m...

 Srinivasa Ramanujan (1887-1920) was an Indian mathematician who made significant contributions to the field of mathematics, particularly in number theory, mathematical analysis, and infinite series. Ramanujan grew up in a poor family in southern India and had very little formal education in mathematics. However, he had a remarkable natural talent for mathematics, and he independently discovered many important mathematical concepts and theorems. Ramanujan's work includes many significant discoveries, such as the formula for the partition function of numbers, the Ramanujan prime and the Ramanujan theta function. His work also led to advances in the study of elliptic functions and the theory of prime numbers. Despite facing many challenges and obstacles throughout his life, including poor health and social discrimination, Ramanujan's contributions to mathematics have had a lasting impact on the field and continue to inspire mathematicians today.