Droidicon provides over 1600 icons, 25 ready-made social badges and more. They’re designed to fit Android apps but will be perfect for other projects as websites and print, too. Droidicon makes it super easy to add icons and badges to your app. All of the social badges are already styled so you can just add them to your app! Or you can customize the icons however you want as they are highly customizable. Add strokes, transparency, and color filters and create badges and icons of any size or color.
Icons are opensource and free to use under MIT licence.