I actually don't mind duplicate posts or threads as are most the case on here. Most people miss it the first time anyway.
Please take the advice of Bice and others have asked about duplicating threads, you aren't thinking about your fellow posters. It is much easier to read about the same video, same article, etc in one thread rather than 3.
If you aren't sure if it has been posted there is a handy search feature to find that topic in a thread and bump that thread with your new comment.