Used by Zurb in Foundation - SVG with PNG fallback icons also, but... differently.
The zip archive have 48px x 48px icons you can find small png ( !! m et s suffixes ) at Github Adam Fairhead
CC Attribution 3.0
.icon-fc-webicon-facebook:
.icon-fc-webicon-rdio:
.icon-fc-webicon-lastfm:
.icon-fc-webicon-dropbox:
.icon-fc-webicon-pinterest:
.icon-fc-webicon-flickr:
.icon-fc-webicon-github:
.icon-fc-webicon-icloud:
.icon-fc-webicon-skitch:
.icon-fc-webicon-dribbble:
.icon-fc-webicon-msn:
.icon-fc-webicon-stumbleupon:
.icon-fc-webicon-skype:
.icon-fc-webicon-tumblr:
.icon-fc-webicon-wordpress:
.icon-fc-webicon-youversion:
.icon-fc-webicon-spotify:
.icon-fc-webicon-quora:
.icon-fc-webicon-behance:
.icon-fc-webicon-rss:
.icon-fc-webicon-zerply:
.icon-fc-webicon-youtube:
.icon-fc-webicon-mail:
.icon-fc-webicon-yelp:
.icon-fc-webicon-evernote:
.icon-fc-webicon-twitter:
.icon-fc-webicon-vimeo:
.icon-fc-webicon-googleplus:
.icon-fc-webicon-foursquare:
.icon-fc-webicon-creativecloud:
.icon-fc-webicon-linkedin: