Look ma, no HTML!
If no icons are specified in the HTML, iOS Safari will search the website’s root directory for icons with the apple-touch-icon or apple-touch-icon-precomposed prefix. For example, if the appropriate icon size for the device is 57 × 57 pixels, iOS searches for filenames in the following order.
Amanda, just assigning this to you in case you have time to pick it up, resizing in Photoshop per the above for our mobile users. Realize we need to book more of your time.
Mobile users need to have touch versions of icons or it will cause 404s on our site.
Probably best based on this:
http://www.askthem.io/assets/mark.png
Alternatively, could use:
http://askthem-tmp.dev/assets/logo.png
Technical details here:
http://mathiasbynens.be/notes/touch-icons
TL;DR
cc @davidmooreppf