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Official logos and branding guidelines for the seven top social networks: Facebook, Twitter, YouTube, LinkedIn, Pinterest, Instagram, and Tumblr. 
http://press.linkedin.com/Media-Resources?SubjectID=644 
https://www.facebookbrand.com/ 
https://twitter.com/logo 
http://www.youtube.com/yt/brand/using-logo.html 
http://business.pinterest.com/logos-and-marketing-guidelines/ 
http://help.instagram.com/393313264071311/ 
http://www.tumblr.com/docs/en