Each tweet on Twitter has a unique URL. You can use this link to navigate directly to the Tweet or to refer someone directly to any Tweet. These direct status links make it easier to share individual Tweets by email or IM.
Here's how to find a Tweet's URL:
Locate the Tweet anywhere on Twitter.com.
Click on the Tweet's timestamp. Below each Tweet, you'll see information about when the Tweet was posted. We call this the "timestamp".