Information and communication technologies can provide an important contribution to revitalizing trade unions, since the internet is faster, cheaper and more far-reaching than traditional communication methods. We propose a typology for analysing trade union websites, and apply this by comparing two national cases. The empirical research is limited to the websites of Portuguese and British civil service trade unions. We find that British unions take more advantage of the internet than those in Portugal; not only do they enable interactivity but above all promote the website as a space for sociability. We believe this typology opens up enhanced capacity to monitor, diachronically and synchronically, the relationship between trade unions and the internet.