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Signs & symbols
Smooth
Social Flat Dual Vertical
rdio
Teal
512x512
slashdot
google, Buzz
yammer
Flat
Social Buttons
pay, paypal
Social Flat Buttons
formspring
mobileme
paypal, Money
News, topics, site
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32px Rounded icons
twitter
32x32
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Pixel
Feed icons
23, Rss
12x12