I accidentally clicked on the "Submit" button at the bottom of one of the HPMOR chapters instead of the next-chapter link. (Anyone who has looked at any of those pages will, I think, appreciate how easy this is to do.) The result is that that chapter now has an empty comment from me. I think the "submit" button should do nothing (or maybe not even exist) when the comment text is empty. (Perhaps also when it's whitespace-only.)
This is already an issue: https://github.com/Discordius/Lesswrong2/issues/168
I thought that instead of everyone having to create a separate post for their first impressions, it would be more convenient to create a single post for this discussion. I'll post my own here soon.