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Social media
Flat
Color Webshop - free
microblog, twidium, Bubble
LightSeaGreen
512x512
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Talking, Comments, hand-drawn
Black
64x64
sheepskin, education, Message
submit, creative, Letter
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Mixed
Pixel
Simply 8-bits #6
Message, Htc
YellowGreen
96x96
Simply 8-bits #7
Message
Avatars & smileys
Jolly Icons — Part 1: Social Media and Communication
Bubble, Messenger, Message
Mobile, Cell, Message
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Travel & hotels
3D
5 O'clock Shades Icon Set
Message, Chat
Tomato
128x128
Signs & symbols
Smooth
Two Tone Design Set
Bubble, Message, Chat
MediumSeaGreen
Tango Icon Library
mail, Message, new
Gainsboro
Desktop apps
Free Social Media Icons
internet, feed, mail
read, open mail, open
DodgerBlue
mail, instant, Messenger
Khaki
light, bulb, Info
CornflowerBlue
speech, about, Bubble
Comments, Communication, sms
telephone, Chat, Call
LightSkyBlue
Message, Chat, announcement
LimeGreen
Christmas
Photorealistic
Standard New Year Icons
Letter, santa, Message
PaleGoldenrod
256x256
Message, year, Email
Wheat
Photography & graphic design
32x32 Free Design Icons
forum, talk, speech
Lavender
32x32
Email, Message, @
Gaming & gambling
48x48 Free Object Icons
forum, Chat, Comment
SkyBlue
48x48