There are lots of free twiiter icons available on net, why not search best ones for you? and list those here. I found 365+ free twitter icons and buttons and i made list of all those collections for you.

100+ Remarkably Beautiful Twitter Icons And Buttons

Hongkiat says, “Catchy graphics are always better than plain text and they are easier to spot. If you are keen to increase Twitter followers, here’s a compilation of 100+ Remarkably Beautiful Twitter Icons And Buttons you can apply on your site.”

100+ Remarkably Beautiful Twitter Icons

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The best Twitter Icons for you

ShareBrain says, “Twitter Bird on your site to attrack your web readers to follow you back. For that reason, we want to share a compilation of freebies with you that will bring you some of the amazing Free Twitter Bird Icons on the internet.”

The best Twitter Icons for you

181 Free Twitter Buttons, Badges, Widget and Counters to Help You Find Followers

TwiTip says, “…Below are some links to places where you can download 181 different free Twitter buttons, widgets, badges and counters to use on your site (actually there are over 181 when you consider the different sizes, colors, formats that are available on some of these options).”

181 Free Twitter Buttons, Badges, Widget and Counters

Over 75+ Beautiful Twitter Design Icons

CreativeNerds says, “This is a great compilation of 75 superb twitter icons, which can be used for your website and even used to help customise your personal twitter profile background.”

Over 75+ Beautiful Twitter Design Icons