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Simple Icons
twitter
Black
4096x4096
twitter, Black
16x16
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Modern UI
twitter, Social, appbar
76x76
Pictonic Free
512x512
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Android icons
sign, twitter
MediumTurquoise
96x96
plus, twitter
iOS 7 icons
twitter, Social, retweet
hashtag, appbar, Social
Simple White Social
DarkSlateGray
36x36
Isometric Social Icons
LightSkyBlue
48x48
Pumpkin Social Icons
Goldenrod
256x256
Graduation Hats Social Icons
DarkTurquoise
Social Icons Sprites
CadetBlue
24x58
DimGray
24x24
Star Burst Social Icons
SkyBlue
64x64
Social Media icons
DeepSkyBlue
72x72
Free icons for Windows8/Metro
Balvardi Social Network Iconset
CornflowerBlue
Buttonz
Buttonz, twitter
Gentleface
