When you tweet something it shows up in your twitter timeline something like this:
" NuNaturals Stevia #giveaway 4 winners 2/28 http://bit.ly/eMBNyF LOW ENTRIES ends 2/28 US Pls RT
This is a copy and paste of one of my actual tweets. Every tweet you tweet has a "timestamp" In my example tweet about it would be the bolded "7 hours ago". Click on your timestamp. It will pull up that individual tweet alone. Copy and paste the URL of the tweet into a comment when entering a giveaway that asks for a link to your tweet.
So the URL to my above tweet looks like this:
http://twitter.com/#!/angiewith3/status/40115201323958272I made this link clickable so you can actually see how it will pull up when you click the time stamp and you can locate the URL (it's in your web brower bar where you type in your web addresses).
When you first tweet, especially in new twitter, it seems to take a couple seconds before the time stamp shows up.
You can also use these directions to get links to an individual Facebook status as well.
Source: http://dockers.contextoptional .com/entries/20111?entry=new
This is a copy and paste of one of my FB status updates. If I were going to get the link, I would click on "Yesterday at 3:32 pm" and again grab the url in the page that comes up with your individual fb status on it.
Hope this helps.