L’explosion du Web 2.0 (blogs, wikis, sites de partage, réseaux sociaux, etc.) ouvre
The explosion of Web 2.0 (blogs, wikis, sharing Web sites, social networks, etc.) opens new perspectives sharing and dealing with information, allowing the collaborative content construction and the open social networks' development. Our work deals with information access issues in a context where the user is both producer and consumer of content. We present a state of the art about the impact of the social information on the Information Retrieval (IR) process, positioning the works in relation to certain aspects of integration of social information within the IR model: approaches based on social relationships or informational content provided by the user.