Many social media platforms provide features for commenting, which often provide affordances for people to give feedback to others. Around the theme of advancing research about online comments, this workshop aims to bring together a diverse range of researchers for cross-discipline community building and especially dedicated time for productive, early mixedmethods research. The workshop is structured around a research "hackathon," where participants actively work on producing initial stages of research, theory, and design related to a central dataset (in the case of this workshop, public comments from a historical reddit.com corpus). Participants will form collaborative teams to tackle questions of interest that move forward current thinking around online comment behaviors, participants, quality, and design. The one-day workshop is led by 5 researchers, and it will accommodate up to 32 participants.