PNG ICO ICNS MORE
UI
Pixel
Berlin
twitter
WhiteSmoke
32x32
Mixed
PixeloPhilia
Blue, bird, twitter
SteelBlue
Fugue Icons
retweet, Balloon, twitter
DarkCyan
16x16
twitter, balloons
SaddleBrown
Social media
32 Pixel Social Media Icons
DeepSkyBlue
Classy Social Media Icons
32px Mantra
twitter, Blue, Bubble
DarkGray
Blue, twitter
Gray
twitter, purple
Bubble, twitter, purple
PC 100 Icon Pack
DarkOrange
Turquoise
WooFunction Icon set
PaleTurquoise
twitter, consultant, user
DarkSlateGray
user, twitter
twitter, web, layout
AliceBlue
Desktop apps
Webset Icons
twitter, Animal, tweet
Black
48x48
Social Networking
tweet, twitter, xcxcvxcv
Social Media Mini
twitter, Balloon
24x24
Balloon, twitter, Left
Kailoon
Animal, twitter, bird
Lavender
Family & home
Snow
bird, Blue, Animal
PNG MORE
Dead simple
CornflowerBlue
15x15