dstiles - 8:01 pm on Jun 19, 2013 (gmt 0)
Although DDG used to run their own bot (and I think still do) I think they now include results from other SEs - ie they have become a semi-meta engine. Looking through the site, though, there is almost no information about their operation and nothing I could find about other-engine-use so I may be wrong. Certainly their webmaster information appears to be lacking.
I have no idea whether they are still collecting data. I haven't seen their bot for a while. Anyone know what IP range (if any, now)? I have a User-Agent of DuckDuckBot.
I notice they no longer seem to have the continual-rolling-results that they used to have and which G copied for a while.