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Network & communications
Pixel
16x16 Free Application Icons
Error
Tomato
16x16
delete
vote, thumbs down, mark
UI
Flat
Flat UI Free
Chat
200x200
infinity, Loop
christmas, gift, Box
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Social media
Round Simple Social Icons
Addthis
58x58
Desktop apps
Metro UI Dock
sketchup, google, Mirror
640x640
sketchup, google
512x512
Flat Social Icons
48x48
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Smooth
Grid style social media icons
creative, Stumbleupon, nerds
64x64
creative, youtube, nerds
3D
3D Social Media Icon Pack
128x128
Glowing Social Network Icons
Tuts+
130x130
Mixed
Gloss set: Basic
tag, red
32x32
Free Applications Icons
Alert, exclamation, General
24x24
Diagona Icons
071
pie, chart
088
fire, Burn, flames
098
offer, splash
delete, cross, remove
148