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Social media
Flat
Micon Social Pack
envelope, Email, Message
Lavender
512x512
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Mixed
Pixel
8-Bit
post, inbox, e-mail
Black
Network & communications
Glyph
Communication & Technology
invite, Letter, share
envelope, send, invite
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UI
Windows 8 metro style
new, post
DarkSlateGray
Travel & hotels
Meanicons
mail, meanicons, post
374x512
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Education & science
Handdrawn
Brainy Icons Free — 36 Science and Education Icons
Computer, Notebook, network
64x64
Desktop apps
3D
Free Social Media Icons
internet, feed, mail
MediumSeaGreen
Photography & graphic design
32x32 Free Design Icons
Email, Message, @
32x32
post, Child, new
Smooth
Facebook SVG icons
wall, post
DarkSeaGreen
posted, post
Gray
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Files & folders
ExplodingBoy Pixel Icons
post
Coral
20x20
CornflowerBlue
LightGray
Recreation & hobbies
Maki
Diagram Pro - free
document, Facebook, post
WhiteSmoke
256x256
Sketchy icons
it, post
128x128
Windows 8 icons
new, post, Child
26x26
post, new
Windows 8 Pack (Metro Style)
Child, post, new
48px web iconset
LightBlue
48x48
Mobile apps
iCandies
telegram, post, button