Tweeter...

When you post something it's called a Tweet.  So then why isn't the website called Tweeter?  Or vice versa the website is called Twitter, so why isn't a post called a Twit?  I mean a lot of the people on there are in fact twits.  It seems like that would make more sense.

For the record I have an account, so I'm not knocking it...I just think it would be more seamless to pick one word and stick with it.