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Social media
Smooth
Modern Web Social Icons
google plus one, google, plus one
DarkSlateGray
256x256
PNG MORE
UI
Pixel
Windows 8 Pack (Metro Style)
plus, google
26x26
Glyph
Social Media Stamps
Activity, base, talk
94x94
google, Maps, base
InFocus Social Media Icons
Logo, Circle, google
40x40
Circular Social Media
google
128x128
Computer & hardware
3D
Human o2
google, Picasa