The paper is intended to present the methodological structure of web-based mechanisms related to planning procedures, with particular focus on social participation. The tools provide a link between planners and local community members, allow the acquisition of different sets of data, provide detailed information on the environment and planned transformations, serve as a source of detailed information on the procedure, and last but not least play an educational role, which contributes greatly to the understanding of sustainability, cultural sensitivity, environmental issues, planning concerns on a wider scale. Web-related technology provides many opportunities to reach for a wider social participation and simultaneously to receive more representative feedback from the local community. The article will discuss in detail some results of the implementation of the Citizen project - a web-based platform supporting the social participation.