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Desktop apps
Flat
Socicons #3
social media, Indaba, Logo
SteelBlue
512x512
Social, social media, media
square, media, social media
Flixster, Social, social media
media, Logo, square
Social media
Micon Social Pack
Four, square, Foursquare
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Smooth
Balvardi Social Network Iconset
Social, Linked in, Logo
128x128
3D
Professional Toolbar Icons - free
square, tweet, bird
64x64
Glyph
Free Social Icons
twitter, square, Blue
square, Tumblr
square, Color, Instagram
square, dropbox
Business & finance
Pretty Office 9
square
256x256
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Social Network Icons
square, Px
350x350