I have reported this at least three (3!)
times via the feedback forum on the main DuckDuckGo site but I'm starting to get the impression that no body really cares about search terms leaking to sites. I first started reporting this back in the middle of September.
If you do a search for any term and then append "!" or "!ducky" to the end the server that you end up at HAS
your search terms.
Will result in this on my server:
[19/Nov/2013:18:26:34 +0000] "GET / HTTP/1.1" 200 5999 "https://duckduckgo.com/?q=michael+yanovi...
This is unacceptable
for a site that claims to be concerned about privacy.