Twitter always asks the question "What's happening?" Each answer to that question is considered a Twitter update, or what people often call a "Tweet." Each update is 140 characters or less.
Another way (some say the best way!) to post updates is from your cell phone. First, set up your phone to link to your Twitter account, then simply send your message as a text to your appropriate Twitter short code.
To delete a Tweet that you have posted, please read this article. Note that you may only delete Tweets which you posted yourself from your account. You may not delete Tweets which were posted by other accounts. Instead, you can unfollow or block users whose tweets you do not want to receive.
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