use the following search parameters to narrow your results:
e.g. sub:pics site:imgur.com dog
sub:pics site:imgur.com dog
advanced search: by author, sub...
Ontario College of Art & Design, Toronto (plus links in comments) (c1.staticflickr.com)
submitted 14 days ago by JasonCarswell to /s/Architecture
Aurora Borealis from the ISS (c1.staticflickr.com)
submitted 16 days ago by Entropick to /s/pics