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Desktop apps
Glyph
Ourea Icons
twitter
Black
256x256
SEO & web
Metro Uinvert Dock
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Social media
Picons Social
512x512
bird, twitter
Social Media
Free Social Icons
square, twitter
twitter, six
twitter, Circle
Pyconic Icons 3 - free
Circle, twitter
Eye, twitter
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Business & finance
Minicons Free
46x46
34x46
UI
Mimi Glyphs
16x16
Mixed
IcoMoon
32x32
InFocus Social Media Icons
twitter, bird
40x40
Black ToolBar Icons
Glyph set
White, twitter, fly
160x160
IconSweets
50x50
Wireframe mono icons
48x48