If you’re not logged in for a few hours and stuff passes through the pipes then it’s gone.
This is why I only follow enough people to fill up my the front page of my feed once every day or so. I understand that some people use twitter in a different way, and follow hundreds of people, but I could never be one of them; of course this also means I've had to unfollow a bunch of people who tweet more than a few times a day.
0. It's like calling someone to see if they got your email. If they read your blog, they read it. If they don't, write something more interesting. If you're so infrequent that you need to tweet when you blog then find something else to do.