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iOS7 optimized
Glyph
Miu
Comment, Comments, other
Black
512x512
Conversation, Bubbles, Comments
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UI
GlyphPack
Comments
Mixed
Handdrawn
Social Messaging & Productivity
Chat, Message, talk
Signs & symbols
Smooth
Social Flat Buttons
Application, tracking, Database
Goldenrod
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Windows 8 metro style
Freecns Cumulus
Bubbles, speech, Comments
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Education & science
Brainy Icons Free — 36 Science and Education Icons
Talking, Comments, hand-drawn
64x64
Desktop apps
3D
Free Social Media Icons
light, bulb, Info
CornflowerBlue
speech, about, Bubble
DodgerBlue
Comments, Communication, sms
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Business & finance
Pixel
24x24 Free Pixel Icons
forum, Social, talk
24x24
Flat UI Icons Free
Bubble, talk, Comment
Social media
Diagram Pro - free
Comments, Discussion, Facebook
256x256
Outline
Eightyshades
Farm-fresh
Comments, twitter
32x32
Facebook, Comments
Minicons Free
46x46
E-commerce & business icons
Windows 8 icons
DarkSlateGray
26x26
IcoMoon
Windows 8 Pack (Metro Style)
Jigsoar
Real Vista Web icons
megaphone, Comments
400x400