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Social media
Handdrawn
Social Aquicons
mail, send, Message
YellowGreen
512x512
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Mixed
Social Messaging & Productivity
send, Comment, mail
Black
sms, Message, Comment
sms, send, Comment
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Jolly Icons Free – 36 Hand-Drawn UI Icons
inbox, letterhead, hand drawn
64x64
Education & science
Brainy Icons Free — 36 Science and Education Icons
submit, creative, Letter
Avatars & smileys
Jolly Icons — Part 1: Social Media and Communication
@, mail, send