This study maps and characterizes the presence of Brazilian Science and Technology Centers and Museums (CMCT) in the "virtual world", seeking to understand how they fit in and relate to the public in these environments. The websites and social media profiles of 185 CMCTs, selected from the guide published by the Brazilian Association of Science and Technology Museums and Centers, were explored, identifying initiatives for virtualizing collections and practices. The result was that 39% of the institutions are present in virtual environments, but this occurs in an erratic, dispersed and outdated manner, especially with limited interactivity or dialogicity.