Online socializing among men who have sex with men and transgender people in Nairobi and Johannesburg and implications for public health‐related research and health promotion: an analysis of qualitative and respondent‐driven sampling survey data - Fearon, Elizabeth; Bourne, Adam; Tenza, Siyanda; Palanee‐Phillips, Thesla; Kabuti, Rhoda; Weatherburn, Peter; Nutland, Will; Kimani, Joshua; Smith, Adrian D (Journal of the International AIDS Society, 2020)