It looks like Duck Duck Go is down at the moment. What is your second choice for privacy respecting search?

I use startpage.

Also a bit unrelated, but I just found that Gigablast shut down 10 months ago. And also this (a bit earlier) comment from the author: (source)

Yeah, Google forced my search engine basically out of business. I had ixquick.com as a big client at one time; I was providing them with search results from my custom web search engine. Then their CEO called me one day and told me he was cancelling, even though he'd been a client for over 10 years. He said it was because of some change Google had made to their agreement. Ixquick needed Google's results and ads for their startpage.com website, and, even though my results were shown on their ixquick.com and later ixquick.eu sites, apparently Google wasn't good with that.