About
As Redditors may know, Reddit keeps track of every time a URL is submitted:
If you attempt to resubmit a link to the same subreddit, Reddit will tell you, and require a different link to submit it again:
The problem is that URLs can differ while pointing to the same webpage. The following links are all the same video
- http://www.youtube.com/watch?v=uRGljemfwUE (basic link)
- http://youtu.be/uRGljemfwUE (shortened link)
- http://www.youtube.com/watch?v=uRGljemfwUE&feature=youtu.be (what the shortened link redirects to)
- http://www.youtube.com/watch?v=uRGljemfwUE&list=FLrzKKs_p0amTiGyFvNYxIrw&index=54&feature=plpp_video (a link from a playlist)
- http://www.youtube.com/watch?v=uRGljemfwUE&foo=bar&bar=foo&abc=123 (any extra key/value pairs)
This bot will detect some, but not all, of these duplicates.