Tom 7 Radar asks Why do posts have to have a ‘title’? (31 Aug at 23:46)
My answer: because blog infrastructure assumes one exists, and without a title a post is wonky. No better reason than that.
And titles really really should be optional. Does every tweet need a title? Do Facebook comments need a title?
Needing a title is friction. Not needing one is an advantage for mersh social media.