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Desktop apps
Flat
Circle Icons
Pages, Facebook
SteelBlue
512x512
Social media
Glyph
Black 48x48 Icons - free
fb, Connections, social network
Black
48x48
Win8 and iOS Tab Bar Icons - free
Communication, Facebook, Like
60x60
3D
Professional Toolbar Icons - free
Like, Community, Connection
64x64
Simple Icons
Facebook
4096x4096
Business & finance
Devine Icons Part 2
128x128
Mobile apps
Squareplex
RoyalBlue
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Plex for Android
Messenger, Facebook
96x96
Ourea Icons
256x256
Circular icon set
Smooth
The Circle Icons
513x513
3D SoftwareFX
PNG ICO ICNS SVG MORE
Funky - free
CornflowerBlue
Social Media - free
web, Facebook, Social
DarkSlateGray
UI
Windows 8 metro style
Metro UI Icon Set
DarkSlateBlue
DarkCyan
Flurry for Social Media
SEO & web
Metro Uinvert Dock