"Why are there no comments on @hi's projects? Am I first?!?!" No, you are not first. You used to be able to see the comments in the 2.0 project days, but that has since changed with the new 3.0 project pages and their new APIs. The 3.0 API seems to have been programmed thinking only 3 letters and longer usernames exist, which should be true but that's a topic for another time. "Well how does that effect projects? Don't projects use number IDs?" Well yes, but for some reason the 3.0 API gets comments by username and ID, as seen in the example below. 3.0 API: https://api.scratch.mit.edu/users/hi/projects/708261/comments?offset=0&limit=20 "So how can I see comments on @hi's projects?" You must use the legacy 2.0 API as shown below. 2.0 API https://scratch.mit.edu/site-api/comments/project/1671642/ "Can I respond to comments on @hi's projects?" Yes. (You think I'm gonna tell you how?)