As L2 (foreign and second language) instructors and materials designers are faced with online and distance learning mandates, new perspectives on how to use familiar, everyday technologies that learners can access from home like social media are welcome. Imagining these new uses, however, may require going beyond the traditional computer-assisted language learning (CALL) metaphors of computer-as-tutor or tool, which were established before social media. This article outlines four new metaphors that better capture the new user dynamics of social media: windows, mirrors, doorways, and playgrounds. After a discussion of the brief history of CALL metaphors, these new metaphors are presented with support from research alongside ideas for L2 teaching and learning.