Look at the top message above - "Please ignore this message for now....." (If you were watching me on Twitter as I was writing this post you may have been wondering what it was all about.). Can you see where it says "12 minutes ago" underneath the message?
Update: to open the page as shown below now, you need to find the time it was posted, which is now at the top right of the tweet. When you hover your mouse over it, the time will change to "Open". Click on this and you will see a line of further information about the tweet underneath it. Click on the word "Details" at the right of this line and your new window will open.
Well, that is the time it was sent, and if you click on the time at the bottom of your message it will open a new page, something like this:
And there you are - your tweet, on a web page of its very own, which you can save as a bookmark or copy the address from the browser bar to give as a link to it. You can come back to your tweet days, months or even years later - the URL will not change.
If you are entering a Rafflecopter based competition and you are really, REALLY quick, once you have clicked "send" on your tweet you will see the message "View it on Twitter" appear in the box just before it closes. Clicking on this will take you straight to the tweet so you can copy the URL. But you have to be quick! The box disappears after only about a second.
If you would like to practise by posting a link to one of your tweets as a reply to this, feel free to give it a try!