Why can't I see all my tweets?  My tweet count is _,___.  Are they lost?
The good news is they're not lost or gone!  We have all your tweets.  The bad news is that we currently only allow you to see the 3200 most recent tweets (this could also be construed as good news, as that number could be lower than 3200).  The other good news is that we are eventually going to build something that will allow you to see ALL your tweets.  Among the gazillion things we want to do to make Twitter better, this hasn't yet reached the top of our list, which is largely based on what we hear from people like you.  At some point, you'll be able to get on a twime machine, visit your twistory, and tweminisce.  That will be a fun day!