LinkDeck is a free set of social icons which has 37 items in grayscale color. The icons are in .PSD format and has 5 sizes included (16*16px, 32*32px, 64*64px, 128*128px, 256*256px). Icons of many popular social services exist in the set (like, Twitter, Facebook, Flickr, Gogle Maps, WordPress and much more).
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The download file includes all of the icons in a large .PSD Format graphic.
The LinkDeck icon pack can be used in both personal and commercial projects.
You may remix/adapt the work, copy and distribute it. All I ask is that you link to this page.