It's not safe to assume the NSA doesn't log DDG searches. Look at the PRISM logo - it's a beam splitter. Read the slide, look at the "Upstream" portion.
They're logging all your URLs and headers. How much are you willing to bet they can't decrypt https? I dont understand all the hubbub _is focused solely_ on direct server access (the bottom half of the slide), when "Upstream" access is just as big a concern.
EDIT: rephrased my concern about direct vs upstream
http://commons.wikimedia.org/wiki/File:Upstream_slide_of_the...
They're logging all your URLs and headers. How much are you willing to bet they can't decrypt https? I dont understand all the hubbub _is focused solely_ on direct server access (the bottom half of the slide), when "Upstream" access is just as big a concern.
EDIT: rephrased my concern about direct vs upstream