(like, the fact that you can't reply directly to someone by default

And even when you can comment on something, you have to keep well within the 250-character maximum. :P Idk, it seems unwieldy to reblog a picture that's already in your blog just so you can reply to a comment. I guess the way Tumblr is set up, you're not really supposed to have a long, thoughtful conversation without cluttering everyone's dashboard. :P

I don't have a twitter account because until now I still couldn't figure it out. >.>