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Desktop apps
Flat
Metro UI Dock
rockmelt
DarkSlateBlue
512x512
Social media
Somacro social media icons
twitter
500x500
Flat Social Icons
Facebook
48x48
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Business & finance
Free PNG Credit Card, Debit Card and Payment Icons
Delta, curved
203x203
straight, Delta
Social Circles
30x30
Mixed
Toolbar icon set 2
Move
32x32