Over the last decade, the sharing economy that covers systems of organised sharing, bartering, lending, trading, renting, gifting, and swapping among communities of peers on Internet platforms has emerged as a major disruptive pattern in capitalist economies (Botsman and Rogers, 2010). Prior research on the sharing economy has mainly concentrated on young, well-educated urban users and therefore particularly underlined “noble” motivations for participation, such as hedonic, environmental, and political reasons. This research looks beyond this “hipster” view of sharing entrepreneurs and focuses on French deprived mothers who use peer-to-peer (P2P) platforms to survive. Drawing on the literature on subsistence markets in developing countries (e.g., Viswanathan et al., 2014), it investigates Facebook buy-and-sell groups as a new form of subsistence markets in developed countries. Using a multi-method approach involving in-depth interviews, netnography, and participatory observation on Facebook buy-and-sell groups, it more particularly explores how Facebook specific digital features participate in these emerging markets. The findings indicate that subsistence markets’ emergence in developed countries on Facebook is founded on new digital features that (re)create structural, cognitive and relational forms of social capital. This research thus offers interesting contributions and implications for public policy makers engaged in the regulation of the sharing economy.