Social Media has changed the way companies advertise. Social Media plays a key role in word of mouth & viral marketing. Consumers play different roles in advertising like decision makers, advocates, informers & others. As users participate in social media conversation, they also play a role in advertisement. Advertisements come with social media buttons like facebook, twitter & youtube profiles. Crowdsourcing for advertisement is also gaining ground with the companies as it helps them to relate with the customers easily. Analyzing the social media conversation provides insights into consumer behavior & this can be included in the advertisement theme. This helps develop easier engagement with the customer. Companies are also advertising heavily into digital marketing & in social media websites.