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People
Flat
Humans
people, threat, Anger
Black
512x512
talk, Discussion, Businessmen
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Google Apps
Discussion
DarkOrange
128x128
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Origami
256x256
Pixeley
DimGray
16x16
Developpers
DarkSlateGray
32x32
eWorld
Discussion, Board
NavajoWhite
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Crystal Clear Actions
user, forum, Discussion
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Social media
Outline
Neon Line Social Circles Black
line, Discussion, Circles
Mixed
Glyph
Simple Icons
Conversation, talk, speak
Network & communications
Material Communication
Discussion, forum
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Octicons
Comment, Discussion
448x512
Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Talking, Comments, hand-drawn
64x64
Business & finance
Pixel
24x24 Free Pixel Icons
Peru
24x24
3D
Diagram Pro - free
Comments, Discussion, Facebook
Avatars & smileys
Smooth
Picnic
Discussion, Conversation
SteelBlue
70x70
UI