Well we ate late night fish balls in Beijing together, so I should know you better!
Actually I'd love to know more about how twitter replaces much of email for you - I don't like having so much of my communication public, and I have a hard time reaching out to someone so publicly. Twitter has never felt natural to me.
re: Twitter - it's not that it "replaces" email. I just find that when I land on a plane and reach for my blackberry and have a choice between email or Twitter I find myself doing the latter.
I get way too much email. I read it all. But it's hard to process it all. Writing back, deciding whether to accept meetings, giving answers to questions, etc. is so time consuming and people are rarely brief.
On Twitter I get to meet new people, interact with friends, have debates, discover information, send private (and short) DMs. Well, on most days I do. Yesterday, my service was cut off because I use a product that Twitter doesn't endorse. That's what prompted my post.
I understand the email overload - if I don't respond to something the same hour, it often takes months.
Still - I view twitter posts as too public for anything remotely sensitive, and DMs as similarly interruptive as SMS - so I rarely DM people I don't know very well. I'm probably wrong to view it this way, and perhaps I should re-evaluate.