Do you delete your tweets?

Do you delete your tweets? I do it all the time. All tweets that do not make sense in single view, especially replies like "yes/no" get deleted. Also, I delete most conversational ones that make little sense without the tweet they replied to. See the example below: http://bit.ly/133smM

DrVes@Allergy Agree.8 minutes ago from web in reply to Allergy

The drawback of Twitter, as compared to FriendFeed, is that you can't see a conversation string without using other services.

I treat tweets like words in a word processor - delete, change and replace until you get the meaning right. A tweet is not a blog post.