I'm not sure about regular user, there's a huge spread. I see most big accounts tweet 5-10+ a day. 10x that for media people. Paul Graham tweets about once per

I'm not sure about regular user, there's a huge spread. I see most big accounts tweet 5-10+ a day. 10x that for media people. Paul Graham tweets about once per every other waking hour (though sometimes not for days). Patrick Collison tweets every 2-3 days.