In order to connect employers and job seekers, Internet sites develop communication technologies such as advertisement search engines. By framing interactions, these encounter tools incorporate implicit representations of the labour market. In a competitive market, information must circulate in a very large space and focus on standard qualities. In a matching market, information targets singular qualities in order to match them. The connection procedure implies a preliminary filtering process of the relevant information, leading to a plurality of formats. Different formats of information are explored in the labour market, with evidence from an empirical study of Internet job boards.