Christophe Strobbe wrote to me as follows:
I am a member of the Web Content Accessibility Guidelines Working Group of the World Wide Web Consortium, and one that came up in a comment on our documents (more specifically this section) is if there are languages in use on the Internet that don’t use paragraphs. I found your web log and noticed that you discuss languages from different language families and with different writing systems, so I wondered if you could shed some light on this or point me to a relevant resource. (Punctuation has not always existed, so there used to be more languages that didn’t use sentences or paragraphs, e.g. Classical Greek, but I’m looking for current examples.)
I told him I didn’t know of any, but I’d ask the assembled multitudes. So: any thoughts?