How can I allow users to select images from their social media to use on my site?

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I am new to APIs. I am working on a site which allows personalized products. I mean you can personalize the product as you want where you can select an image from your computer. But now my problem is I want to allow user to select the image from their social networking site (like Facebook, Google+, Instagram) as well as they can select images from their Google drive and Dropbox also.

Please help me to resolve this problem.

Thank You,

Ashish Shah

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