Heh... apparently it's for everything, you haven't quite solved the problem of having it be "for videos" yet, unless you're just planning to delete non-video submissions.
If you want to limit it to just video submissions, you might want to have a whitelist of sites users can select from in the submit form, and then do some scraping/API work to find actual video links in the URLs. Having embeds in the threads would be nice, too.
Also, to me personally, your favicon and banner color look a bit too much like Youtube's.
The source code is here on GitHub : https://github.com/netgusto/hackervid.io