Channel factors and LiveJournalI never cared much about the distinction between Blogger and LiveJournal--they're both hosted services for publishing blogs. (Or "livejournals," if you go to Berkeley.) But LiveJournal-managed sites always had rampant comments, something that I was honestly a little jealous of. So much visible community-building.
Today I learned why. While Blogger doesn't automatically tell people when others have commented on their comments (and in fact, I tend to manually email replies to people), LiveJournal lets you comment on a comment right in your email client. So easy. Ross and Nisbett would be proud of the channel factor.