For webmarketing, social media has become essential. Social networks allow to develop the brand image and to have a direct exchange with consumers. Moreover, thanks to various marketing operations, a site will be able to increase its notoriety and attract new visitors. The latter will increase the site's traffic, its popularity and therefore its referencing on search engines. All these techniques are grouped together in the referencing dedicated to social networks, the SMO (social media optimization). To sum up, social media, and more precisely the presence on social media, must be an integral part of the communication and development strategy of sites wishing to generate high traffic. It is therefore necessary for a company to take advantage of these millions of social media users and do everything possible to ensure its presence on social networks.