Does anyone know what's going on here?

[james_davis_nicoll]

Unrelated comment: over the last ten or twenty entries in your journal, I'm seeing a disturbing frequency (low, but nonzero) of comments from regular posters that are just totally blank. A few with 'edited at' italic lines, but most not. Posters that I do not recall having a history of posting blank comments.

For example, on this post they are, in order:
realinterrobang's second followup to martianmooncrab's comment
kithrup's followup to neowolf2's comment
realinterrobang's followup to xiphias' comment, and to jhetley's comment
beamjockey's comment (so it's not just followups to comments)