In 21st century, social networks and blogs are gaining a lot of popularity among youth. Social networking sites and blogs have played a crucial role in bridging boundaries and crossing the seas and enabling them to communicate on a common platform. It has become a popular and a potential mean for them to stay friends with the existing ones and to grow up their social circle at least in terms of acquaintances. Through this book, I try to find out the impact of social networks and blogs on buy behavior of consumer influencing their personal and professional lives. The book is initiated with the definition of the objective followed with the research methodology used along with the research design, sample size, methods used for the purpose of conducting survey followed by the brief description of the most popular sites and the issues of concern which have come up along the way in all these years since these sites gained popularity are discussed. The next part of the research has the literature surveys comprise of different theories, terminology followed by some practical examples.