In recent years, reports and anecdotal evidence pointing at the role of
WhatsApp in a variety of events, ranging from elections to collective violence,
have emerged. While academic research should examine the validity of these
claims, obtaining WhatsApp data for research is notably challenging,
contrasting with the relative abundance of data from platforms like Facebook
and Twitter, where user "information diets" have been extensively studied. This
lack of data is particularly problematic since misinformation and hate speech
are major concerns in the set of Global South countries in which WhatsApp
dominates the market for messaging. To help make research on these questions,
and more generally research on WhatsApp, possible, this paper introduces
WhatsApp Explorer, a tool designed to enable WhatsApp data collection on a
large scale. We discuss protocols for data collection, including potential
sampling approaches, and explain why our tool (and adjoining protocol) arguably
allow researchers to collect WhatsApp data in an ethical and legal manner, at
scale