Many online competitions require you to post a particular message on Twitter and Facebook, and then post the links to the tweet and Facebook message back for proof.
I already posted how you can get direct link to a particular tweet. Here’s the procedure to get the direct link to a specific Facebook comment.
Go to the website using the Facebook commenting system, or open the Facebook page where you posted the comment. Right click on the date/time field just below the Facebook comment, and click on copy link location or copy link address.
That’s it. Now you can paste the link anywhere or share it online and it will point to the specific Facebook comment.