Mandeville and colleagues describe a fascinating case where Facebook was used to warn potential contacts that their acquaintance had a communicable disease (Mandeville et al., 2013). They are correct that this case raises important issues about social media, confidentiality and the prevention of harm. However, they underestimate both the dangers of overcommunication via Wall and Timeline postings (and Twitter) and the potential utility of Facebook in cases like this one. Increased awareness of Facebook functionality will allow more accurate targeting of those at risk of infection, while also protecting the confidentiality of the index case.