Is yimg.com part of WP-Touch?

My host is telling me that we are getting alot Iframe entries from yimg.com as you see below. Are these part of WP Touch. I’m wondering if this site is creating the images for plugin to display?

Thanks
Bryan

p-content/plugins/wptouch/themes/foundation/modules/media/fitvids.js:       'iframe[src*="d.yimg.com"]',
wp-content/wptouch-data/cache/wptouch-3d70f01b16cf1b12330737ec399979adbcbad44b.js: 	"iframe[src^='https://d.yimg.com']",
wp-content/wptouch-data/cache/wptouch-7a4191c96b4b53d2712fd60440a281a83f7c2cd0.js: 	"iframe[src^='https://d.yimg.com']",
wp-content/wptouch-data/cache/wptouch-d5d466eca577381938c1cc72461b9df8800c2f9a.js: 	"iframe[src^='https://d.yimg.com']",
wp-content/wptouch-data/cache/wptouch-5342238763802a5e0c8b23167e6a6fa483717309.js: 	"iframe[src^='https://d.yimg.com']",
wp-content/wptouch-data/cache/wptouch-ff218fb2d360e062e9f6bfc17120de4d8d582d32.js: 	"iframe[src^='https://d.yimg.com']",
wp-content/wptouch-data/cache/wptouch-bf8bf0f8a2cc8a3f6aa7cec34e34ada7c9e5d087.js: 	"iframe[src^='https://d.yimg.com']",