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This book constitutes the refereed proceedings of the 11th International Conference on Electronic Commerce and Web Technologies (EC-Web) held in Bilbao, Spain, in September 2010. §The 22 papers accepted for EC-Web, selected from 45 submissions, are organized in topical sessions on recommender systems; e-payment, security and trust; service-oriented e-commerce and business processes; and agent-based e-commerce . The volume is completed by short summaries of the two invited talks on web advertising and electronic markets.