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Social media
Smooth
A Clean Mini Social Media Icon Set
Stumbleupon
LimeGreen
32x32
WPZOOM Social Networking Icon Set
64x64
Social Poststamps
Stamp, Technorati
128x128
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Desktop apps
Polaroid
62x78
Function Social Icons
Social, Technorati
48x48
KDE Crystal Diamond
icon | Icon search engine
16x16