Currently any question on Programmers SE (this for example) page source contains this in the
<link rel="apple-touch-icon" href="http://cdn.sstatic.net/programmers/img/apple-touch-icon.png"> [SKIPPED] <link rel="image_src" href="http://sstatic.net/programmers/img/apple-touch-icon.png">
and looks like the same goes for any other Stack Exchange site except Meta.
For any given site the two images look completely identical and loading them twice from different URLs looks completely useless.
- why those are two distinct URLs instead of one URL
- why these two links are present on pages with questions only, but the main page only contains the first link