I would be very careful about adding a copy to clipboard feature in a website like this. At the very least i hope you will strip newlines in case you implement this. Would be quite awful to copy something without noticing and running it if you mistakenly paste it in a console.
Cool project! Are you considering any kind of vetting mechanism for sorting the great stuff from the less great stuff, e.g. user voting or similar?
Yes, that will be added! For the first release I mostly just wanted to get the basics working.