Facebook is an online social networking service headquartered in Menlo Park, California. Facebook has more than one billion users and is the largest social networking sites now. Internet is the best medium for communication fast, for entertainment and for information about products. Facebook has more than one billion users and is the largest social networking site. Online advertising are affordable, can reach a specific targeted audience, easy to track, flexible payment than other medium and more informative and better to improve the brand within a short time Facebook has many options to earn money such as gifts and payments but advertising is the most dominant part of Facebook revenue generator. In 2012 Facebook earned more than 1.09b US dollars, a 36 per cent increase by last year. It was observed from the study that mostly people visiting facebook website were aware about the advertised product/s they saw on facebook. It is a challenging task to create interest in the consumers' mind about the advertised product. people felt that advertisement were interesting. Respondents liked the product after watching it's advertisement on Facebook. Most of the respondents agree that the facebook advertisements contain lot of information. it appears that people are less worried about whether the real product will be as same as the advertised product.