This article investigates the use of Internet networks during the recent mobilisation of Californian Walmart workers. The findings of this case study suggest that Internet‐based mass self‐communication networks (Facebook, YouTube, etc.) can complement traditional organising techniques. Mass self‐communication networks ameliorate many of the weaknesses identified by previous studies of Internet networks. In particular, these types of networks can help overcome negative dispositions towards unions, increase the density of communication and the level of participation among members, create a collective identity congruent with trade unionism, facilitate organisation and spread ‘swarming actions’ which are effective at leveraging symbolic power. Moreover, unions may be well suited to providing crucial strategic oversight and coordination to wider worker networks.