Grapigs : Terms of use 
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This set of Social Media Icons' has been created by Grapigs Team 
These  are completely free for personal and commercial use.
You can modify any resources to your liking to fit into your project. We appreciate if you do credit our resources and help spread the word about us.
You are not allowed redistribute, resell or offer our resources to any third party. This includes uploading our resources to another website and offering our resources as a separate attachment with any of your work.

The Grapigs Team.
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http://www.grapigs.com