Sorry if this has been posted twice coz I'm not sure if it has been posted.

We need to approve a post before it becomes visible to everyone. You check it even before it has been approved by visiting your home node and clicking on "writeups". You won't see the other post now, since it's been deleted.

is it possible that we could intercept the invalid result from the DNS server, send the user typed url as keywords to a search engine, and display the search results to this user?

Firefox already does that, kinda. If you type in a bad URL, it does a google search and loads up the first match.