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March 6th, 2010 
Twitter oAuth Button Set
Twibs was created by a small group of people with one purpose: Give twitter users a place to find businesses on twitter.
Twibs has created a license-free, button set for Twitter API developers to use for oAuth.
The icons are in .gif and .PSD formats. If you are going to create a social network, Twitter oAuth Button Set is great for you.
Tags: oauth button, oauth icon, twitter buttons, Twitter icons, twitter oauth button
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There are also some official buttons: http://apiwiki.twitter.com/Sign-in-with-Twitter